CppEditor: Add QuickFix to generate a constructor

Change-Id: Iba2ce3bfa1a1d1a325626a21f46b485d12cbb060
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/3rdparty/cplusplus/AST.h

@@ -75,7 +75,50 @@ public:
 
     Tptr value;
     List *next;
+
+    class ListIterator
+    {
+        List<Tptr> *iter;
+
+    public:
+        ListIterator(List<Tptr> *iter)
+            : iter(iter)
+        {}
+        Tptr operator*() { return iter->value; }
+        ListIterator &operator++()
+        {
+            if (iter)
+                iter = iter->next;
+            return *this;
+        }
+        bool operator==(ListIterator other) { return iter == other.iter; }
+        bool operator!=(ListIterator other) { return iter != other.iter; }
     };
+    ListIterator begin() { return {this}; }
+    ListIterator end() { return {nullptr}; }
+
+    int size() { return next ? next->size() + 1 : 1; }
+};
+
+template<typename Tptr>
+typename List<Tptr>::ListIterator begin(List<Tptr> *list)
+{
+    return list ? list->begin() : typename List<Tptr>::ListIterator(nullptr);
+}
+
+template<typename Tptr>
+typename List<Tptr>::ListIterator end(List<Tptr> *list)
+{
+    return list ? list->end() : typename List<Tptr>::ListIterator(nullptr);
+}
+
+template<typename Tptr>
+int size(List<Tptr> *list)
+{
+    if (list)
+        return list->size();
+    return 0;
+}
 
 class CPLUSPLUS_EXPORT AST: public Managed
 {

src/plugins/cppeditor/cppeditorplugin.h

@@ -231,6 +231,9 @@ private slots:
     void test_quickfix_removeUsingNamespace_simple();
     void test_quickfix_removeUsingNamespace_differentSymbols();
 
+    void test_quickfix_generateConstructor_data();
+    void test_quickfix_generateConstructor();
+
     void test_quickfix_InsertVirtualMethods_data();
     void test_quickfix_InsertVirtualMethods();
     void test_quickfix_InsertVirtualMethods_implementationFile();

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -7576,5 +7576,285 @@ void CppEditorPlugin::test_quickfix_removeUsingNamespace_differentSymbols()
     QuickFixOperationTest(testDocuments, &factory, ProjectExplorer::HeaderPaths(), 0);
 }
 
+enum ConstructorLocation { Inside, Outside, CppGenNamespace, CppGenUsingDirective, CppRewriteType };
+
+void CppEditorPlugin::test_quickfix_generateConstructor_data()
+{
+    QTest::addColumn<QByteArray>("original_header");
+    QTest::addColumn<QByteArray>("expected_header");
+    QTest::addColumn<QByteArray>("original_source");
+    QTest::addColumn<QByteArray>("expected_source");
+    QTest::addColumn<int>("location");
+    const int Inside = ConstructorLocation::Inside;
+    const int Outside = ConstructorLocation::Outside;
+    const int CppGenNamespace = ConstructorLocation::CppGenNamespace;
+    const int CppGenUsingDirective = ConstructorLocation::CppGenUsingDirective;
+    const int CppRewriteType = ConstructorLocation::CppRewriteType;
+
+    QByteArray header = R"--(
+class@ Foo{
+    int test;
+    static int s;
+};
+)--";
+    QByteArray expected = R"--(
+class Foo{
+    int test;
+    static int s;
+public:
+    Foo(int test) : test(test)
+    {}
+};
+)--";
+    QTest::newRow("ignore static") << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+class@ Foo{
+    CustomType test;
+};
+)--";
+    expected = R"--(
+class Foo{
+    CustomType test;
+public:
+    Foo(CustomType test) : test(std::move(test))
+    {}
+};
+)--";
+    QTest::newRow("Move custom value types")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+class@ Foo{
+    int test;
+protected:
+    Foo() = default;
+};
+)--";
+    expected = R"--(
+class Foo{
+    int test;
+public:
+    Foo(int test) : test(test)
+    {}
+
+protected:
+    Foo() = default;
+};
+)--";
+
+    QTest::newRow("new section before existing")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+class@ Foo{
+    int test;
+};
+)--";
+    expected = R"--(
+class Foo{
+    int test;
+public:
+    Foo(int test) : test(test)
+    {}
+};
+)--";
+    QTest::newRow("new section at end")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+class@ Foo{
+    int test;
+public:
+    /**
+     * Random comment
+     */
+    Foo(int i, int i2);
+};
+)--";
+    expected = R"--(
+class Foo{
+    int test;
+public:
+    Foo(int test) : test(test)
+    {}
+    /**
+     * Random comment
+     */
+    Foo(int i, int i2);
+};
+)--";
+    QTest::newRow("in section before")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+class@ Foo{
+    int test;
+public:
+    Foo() = default;
+};
+)--";
+    expected = R"--(
+class Foo{
+    int test;
+public:
+    Foo() = default;
+    Foo(int test) : test(test)
+    {}
+};
+)--";
+    QTest::newRow("in section after")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    const QByteArray common = R"--(
+namespace N{
+    template<typename T>
+    struct vector{
+    };
+}
+)--";
+    header = common + R"--(
+namespace M{
+enum G{g};
+class@ Foo{
+    N::vector<G> g;
+    enum E{e}e;
+public:
+};
+}
+)--";
+
+    expected = common + R"--(
+namespace M{
+enum G{g};
+class@ Foo{
+    N::vector<G> g;
+    enum E{e}e;
+public:
+    Foo(const N::vector<G> &g, E e);
+};
+
+Foo::Foo(const N::vector<G> &g, Foo::E e) : g(g),
+    e(e)
+{}
+
+}
+)--";
+    QTest::newRow("source: right type outside class ")
+        << QByteArray() << QByteArray() << header << expected << Outside;
+    expected = common + R"--(
+namespace M{
+enum G{g};
+class@ Foo{
+    N::vector<G> g;
+    enum E{e}e;
+public:
+    Foo(const N::vector<G> &g, E e);
+};
+}
+
+
+inline M::Foo::Foo(const N::vector<M::G> &g, M::Foo::E e) : g(g),
+    e(e)
+{}
+
+)--";
+    QTest::newRow("header: right type outside class ")
+        << header << expected << QByteArray() << QByteArray() << Outside;
+
+    expected = common + R"--(
+namespace M{
+enum G{g};
+class@ Foo{
+    N::vector<G> g;
+    enum E{e}e;
+public:
+    Foo(const N::vector<G> &g, E e);
+};
+}
+)--";
+    const QByteArray source = R"--(
+#include "file.h"
+)--";
+    QByteArray expected_source = R"--(
+#include "file.h"
+
+
+namespace M {
+Foo::Foo(const N::vector<G> &g, Foo::E e) : g(g),
+    e(e)
+{}
+
+}
+)--";
+    QTest::newRow("source: right type inside namespace")
+        << header << expected << source << expected_source << CppGenNamespace;
+
+    expected_source = R"--(
+#include "file.h"
+
+using namespace M;
+Foo::Foo(const N::vector<G> &g, Foo::E e) : g(g),
+    e(e)
+{}
+)--";
+    QTest::newRow("source: right type with using directive")
+        << header << expected << source << expected_source << CppGenUsingDirective;
+
+    expected_source = R"--(
+#include "file.h"
+
+M::Foo::Foo(const N::vector<M::G> &g, M::Foo::E e) : g(g),
+    e(e)
+{}
+)--";
+    QTest::newRow("source: right type while rewritung types")
+        << header << expected << source << expected_source << CppRewriteType;
+}
+
+void CppEditorPlugin::test_quickfix_generateConstructor()
+{
+    class TestFactory : public GenerateConstructor
+    {
+    public:
+        TestFactory() { setTest(); }
+    };
+
+    QFETCH(QByteArray, original_header);
+    QFETCH(QByteArray, expected_header);
+    QFETCH(QByteArray, original_source);
+    QFETCH(QByteArray, expected_source);
+    QFETCH(int, location);
+
+    QuickFixSettings s;
+    s->valueTypes << "CustomType";
+    using L = ConstructorLocation;
+    if (location == L::Inside) {
+        s->setterInCppFileFrom = -1;
+        s->setterOutsideClassFrom = -1;
+    } else if (location == L::Outside) {
+        s->setterInCppFileFrom = -1;
+        s->setterOutsideClassFrom = 1;
+    } else if (location >= L::CppGenNamespace && location <= L::CppRewriteType) {
+        s->setterInCppFileFrom = 1;
+        s->setterOutsideClassFrom = -1;
+        using Handling = CppQuickFixSettings::MissingNamespaceHandling;
+        if (location == L::CppGenNamespace)
+            s->cppFileNamespaceHandling = Handling::CreateMissing;
+        else if (location == L::CppGenUsingDirective)
+            s->cppFileNamespaceHandling = Handling::AddUsingDirective;
+        else if (location == L::CppRewriteType)
+            s->cppFileNamespaceHandling = Handling::RewriteType;
+    } else {
+        QFAIL("location is none of the values of the ConstructorLocation enum");
+    }
+
+    QList<QuickFixTestDocument::Ptr> testDocuments;
+    testDocuments << QuickFixTestDocument::create("file.h", original_header, expected_header);
+    testDocuments << QuickFixTestDocument::create("file.cpp", original_source, expected_source);
+    TestFactory factory;
+    QuickFixOperationTest(testDocuments, &factory);
+}
+
 } // namespace Internal
 } // namespace CppEditor

src/plugins/cppeditor/cppquickfixes.cpp

@@ -413,10 +413,12 @@ QStringList getNamespaceNames(const Symbol *symbol)
 
 // TODO: We should use the "CreateMissing" approach everywhere.
 enum class NamespaceHandling { CreateMissing, Ignore };
-InsertionLocation insertLocationForMethodDefinition(Symbol *symbol, const bool useSymbolFinder,
+InsertionLocation insertLocationForMethodDefinition(Symbol *symbol,
+                                                    const bool useSymbolFinder,
                                                     NamespaceHandling namespaceHandling,
-                                                    CppRefactoringChanges& refactoring,
-                                                    const QString& fileName)
+                                                    const CppRefactoringChanges &refactoring,
+                                                    const QString &fileName,
+                                                    QStringList *insertedNamespaces = nullptr)
 {
     QTC_ASSERT(symbol, return InsertionLocation());
 
@@ -484,6 +486,8 @@ InsertionLocation insertLocationForMethodDefinition(Symbol *symbol, const bool u
         prefix += "namespace " + ns + " {\n";
         suffix += "}\n";
     }
+    if (insertedNamespaces)
+        *insertedNamespaces = visitor.remainingNamespaces();
 
     //TODO watch for moc-includes
 
@@ -3689,7 +3693,7 @@ Utils::optional<FullySpecifiedType> getFirstTemplateParameter(FullySpecifiedType
 
 QString symbolAtDifferentLocation(const CppQuickFixInterface &interface,
                                   Symbol *symbol,
-                                  CppRefactoringFilePtr &targetFile,
+                                  const CppRefactoringFilePtr &targetFile,
                                   InsertionLocation targetLocation)
 {
     QTC_ASSERT(symbol, return QString());
@@ -3713,12 +3717,20 @@ QString symbolAtDifferentLocation(const CppQuickFixInterface &interface,
 FullySpecifiedType typeAtDifferentLocation(const CppQuickFixInterface &interface,
                                            FullySpecifiedType type,
                                            Scope *originalScope,
-                                           CppRefactoringFilePtr &targetFile,
-                                           InsertionLocation targetLocation)
+                                           const CppRefactoringFilePtr &targetFile,
+                                           InsertionLocation targetLocation,
+                                           const QStringList &newNamespaceNamesAtLoc = {})
 {
     Scope *scopeAtInsertPos = targetFile->cppDocument()->scopeAt(targetLocation.line(),
                                                                  targetLocation.column());
-
+    for (const QString &nsName : newNamespaceNamesAtLoc) {
+        const QByteArray utf8Name = nsName.toUtf8();
+        Control *control = targetFile->cppDocument()->control();
+        const Name *name = control->identifier(utf8Name.data(), utf8Name.size());
+        Namespace *ns = control->newNamespace(0, name);
+        ns->setEnclosingScope(scopeAtInsertPos);
+        scopeAtInsertPos = ns;
+    }
     LookupContext cppContext(targetFile->cppDocument(), interface.snapshot());
     ClassOrNamespace *cppCoN = cppContext.lookupType(scopeAtInsertPos);
     if (!cppCoN)
@@ -3750,21 +3762,24 @@ struct ExistingGetterSetterData
 class GetterSetterRefactoringHelper
 {
 public:
-    GetterSetterRefactoringHelper(CppQuickFixOperation *operation, const QString &fileName, Class *clazz)
+    GetterSetterRefactoringHelper(CppQuickFixOperation *operation,
+                                  const QString &fileName,
+                                  Class *clazz)
         : m_operation(operation)
         , m_changes(m_operation->snapshot())
         , m_locator(m_changes)
-        , m_class(clazz)
-    {
-        m_headerFile = m_changes.file(fileName);
+        , m_headerFile(m_changes.file(fileName))
+        , m_sourceFile([&] {
             QString cppFileName = correspondingHeaderOrSource(fileName, &m_isHeaderHeaderFile);
             if (!m_isHeaderHeaderFile || !QFile::exists(cppFileName)) {
                 // there is no "source" file
-            m_sourceFile = m_headerFile;
+                return m_headerFile;
             } else {
-            m_sourceFile = m_changes.file(cppFileName);
-        }
+                return m_changes.file(cppFileName);
             }
+        }())
+        , m_class(clazz)
+    {}
 
     void performGeneration(ExistingGetterSetterData data, int generationFlags);
 
@@ -3798,7 +3813,8 @@ public:
         }
     }
 
-    bool hasSourceFile() { return m_headerFile != m_sourceFile; }
+    bool hasSourceFile() const { return m_headerFile != m_sourceFile; }
+    bool isHeaderHeaderFile() const { return m_isHeaderHeaderFile; }
 
 protected:
     void insertAndIndent(const RefactoringFilePtr &file,
@@ -3831,17 +3847,86 @@ protected:
         return type;
     }
 
-    QString symbolAt(Symbol *symbol, CppRefactoringFilePtr &targetFile, InsertionLocation targetLocation)
+    QString symbolAt(Symbol *symbol,
+                     const CppRefactoringFilePtr &targetFile,
+                     InsertionLocation targetLocation)
     {
         return symbolAtDifferentLocation(*m_operation, symbol, targetFile, targetLocation);
     }
 
     FullySpecifiedType typeAt(FullySpecifiedType type,
                               Scope *originalScope,
-                              CppRefactoringFilePtr &targetFile,
-                              InsertionLocation targetLocation)
+                              const CppRefactoringFilePtr &targetFile,
+                              InsertionLocation targetLocation,
+                              const QStringList &newNamespaceNamesAtLoc = {})
     {
-        return typeAtDifferentLocation(*m_operation, type, originalScope, targetFile, targetLocation);
+        return typeAtDifferentLocation(*m_operation,
+                                       type,
+                                       originalScope,
+                                       targetFile,
+                                       targetLocation,
+                                       newNamespaceNamesAtLoc);
+    }
+
+    /**
+     * @brief checks if the type in the enclosing scope in the header is a value type
+     * @param type a type in the m_headerFile
+     * @param enclosingScope the enclosing scope
+     * @param customValueType if not nullptr set to true when value type comes
+     * from CppQuickFixSettings::isValueType
+     * @return true if it is a pointer, enum, integer, floating point, reference, custom value type
+     */
+    bool isValueType(FullySpecifiedType type, Scope *enclosingScope, bool *customValueType = nullptr)
+    {
+        if (customValueType)
+            *customValueType = false;
+        // a type is a value type if it is one of the following
+        const auto isTypeValueType = [](const FullySpecifiedType &t) {
+            return t->isPointerType() || t->isEnumType() || t->isIntegerType() || t->isFloatType()
+                   || t->isReferenceType();
+        };
+        if (type->isNamedType()) {
+            // we need a recursive search and a lookup context
+            LookupContext context(m_headerFile->cppDocument(), m_changes.snapshot());
+            auto isValueType = [settings = m_settings,
+                                &customValueType,
+                                &context,
+                                &isTypeValueType](const Name *name,
+                                                  Scope *scope,
+                                                  auto &isValueType) mutable -> bool {
+                // maybe the type is a custom value type by name
+                if (const Identifier *id = name->identifier()) {
+                    if (settings->isValueType(QString::fromUtf8(id->chars(), id->size()))) {
+                        if (customValueType)
+                            *customValueType = true;
+                        return true;
+                    }
+                }
+                // search for the type declaration
+                QList<LookupItem> localLookup = context.lookup(name, scope);
+                for (auto &&i : localLookup) {
+                    if (isTypeValueType(i.type()))
+                        return true;
+                    if (i.type()->isNamedType()) { // check if we have to search recursively
+                        const Name *newName = i.type()->asNamedType()->name();
+                        Scope *newScope = i.declaration()->enclosingScope();
+                        if (newName == name && newScope == scope)
+                            continue; // we have found the start location of the search
+                        return isValueType(newName, newScope, isValueType);
+                    }
+                    return false;
+                }
+                return false;
+            };
+            // start recursion
+            return isValueType(type->asNamedType()->name(), enclosingScope, isValueType);
+        }
+        return isTypeValueType(type);
+    }
+
+    bool isValueType(Symbol *symbol, bool *customValueType = nullptr)
+    {
+        return isValueType(symbol->type(), symbol->enclosingScope(), customValueType);
     }
 
     void addHeaderCode(InsertionPointLocator::AccessSpec spec, QString code)
@@ -3864,31 +3949,38 @@ protected:
         return loc;
     }
 
-    InsertionLocation sourceLocationFor(Declaration *declarationSymbol)
+    InsertionLocation sourceLocationFor(Symbol *symbol, QStringList *insertedNamespaces = nullptr)
     {
         if (m_sourceFileInsertionPoint.isValid())
             return m_sourceFileInsertionPoint;
-        m_sourceFileInsertionPoint = insertLocationForMethodDefinition(
-            declarationSymbol,
+        m_sourceFileInsertionPoint
+            = insertLocationForMethodDefinition(symbol,
                                                 false,
-            m_settings->createMissingNamespacesinCppFile() ? NamespaceHandling::CreateMissing
+                                                m_settings->createMissingNamespacesinCppFile()
+                                                    ? NamespaceHandling::CreateMissing
                                                     : NamespaceHandling::Ignore,
                                                 m_changes,
-            m_sourceFile->fileName());
+                                                m_sourceFile->fileName(),
+                                                insertedNamespaces);
         if (m_settings->addUsingNamespaceinCppFile()) {
             // check if we have to insert a using namespace ...
-            auto requiredNamespaces = getNamespaceNames(declarationSymbol->enclosingClass());
+            auto requiredNamespaces = getNamespaceNames(
+                symbol->isClass() ? symbol : symbol->enclosingClass());
             NSCheckerVisitor visitor(m_sourceFile.get(),
                                      requiredNamespaces,
                                      m_sourceFile->position(m_sourceFileInsertionPoint.line(),
                                                             m_sourceFileInsertionPoint.column()));
             visitor.accept(m_sourceFile->cppDocument()->translationUnit()->ast());
+            if (insertedNamespaces)
+                insertedNamespaces->clear();
             if (auto rns = visitor.remainingNamespaces(); !rns.empty()) {
                 QString ns = "using namespace ";
                 for (auto &n : rns) {
                     if (!n.isEmpty()) { // we have to ignore unnamed namespaces
                         ns += n;
                         ns += "::";
+                        if (insertedNamespaces)
+                            insertedNamespaces->append(n);
                     }
                 }
                 ns.resize(ns.size() - 2); // remove last '::'
@@ -3911,20 +4003,22 @@ protected:
         m_sourceFileCode += code;
     }
 
+protected:
+    CppQuickFixOperation *const m_operation;
+    const CppRefactoringChanges m_changes;
+    const InsertionPointLocator m_locator;
+    const CppRefactoringFilePtr m_headerFile;
+    const CppRefactoringFilePtr m_sourceFile;
+    CppQuickFixSettings *const m_settings = CppQuickFixProjectsSettings::getQuickFixSettings(
+        ProjectExplorer::ProjectTree::currentProject());
+    Class *const m_class;
+
 private:
-    CppQuickFixOperation *m_operation;
-    CppRefactoringChanges m_changes;
-    CppRefactoringFilePtr m_headerFile;
-    CppRefactoringFilePtr m_sourceFile;
     ChangeSet m_headerFileChangeSet;
     ChangeSet m_sourceFileChangeSet;
-    InsertionPointLocator m_locator;
     QMap<InsertionPointLocator::AccessSpec, InsertionLocation> m_headerInsertionPoints;
     InsertionLocation m_sourceFileInsertionPoint;
-    CppQuickFixSettings *m_settings = CppQuickFixProjectsSettings::getQuickFixSettings(
-        ProjectExplorer::ProjectTree::currentProject());
     QString m_sourceFileCode;
-    Class *m_class;
     QMap<InsertionPointLocator::AccessSpec, QString> m_headerFileCode;
     bool m_isHeaderHeaderFile; // the "header" (where the class is defined) can be a source file
 };
@@ -4070,47 +4164,8 @@ void GetterSetterRefactoringHelper::performGeneration(ExistingGetterSetterData d
     overview.showTemplateParameters = true;
 
     // Ok... - If a type is a Named type we have to search recusive for the real type
-    const bool isValueType = [settings = m_settings,
-                              scope = data.declarationSymbol->enclosingScope(),
-                              document = m_headerFile->cppDocument(),
-                              &snapshot = m_changes.snapshot()](FullySpecifiedType type) {
-        // a type is a value type if it is one of the following
-        const auto isTypeValueType = [](const FullySpecifiedType &t) {
-            return t->isPointerType() || t->isEnumType() || t->isIntegerType() || t->isFloatType()
-                   || t->isReferenceType();
-        };
-        if (type->isNamedType()) {
-            // we need a recursive search and a lookup context
-            LookupContext context(document, snapshot);
-            auto isValueType = [settings, &context, &isTypeValueType](const Name *name,
-                                                                      Scope *scope,
-                                                                      auto &isValueType) mutable -> bool {
-                // maybe the type is a custom value type by name
-                if (const Identifier *id = name->identifier()) {
-                    if (settings->isValueType(QString::fromUtf8(id->chars(), id->size())))
-                        return true;
-                }
-                // search for the type declaration
-                QList<LookupItem> localLookup = context.lookup(name, scope);
-                for (auto &&i : localLookup) {
-                    if (isTypeValueType(i.type()))
-                        return true;
-                    if (i.type()->isNamedType()) { // check if we have to search recursively
-                        const Name *newName = i.type()->asNamedType()->name();
-                        Scope *newScope = i.declaration()->enclosingScope();
-                        if (newName == name && newScope == scope)
-                            continue; // we have found the start location of the search
-                        return isValueType(newName, newScope, isValueType);
-                    }
-                    return false;
-                }
-                return false;
-            };
-            // start recursion
-            return isValueType(type->asNamedType()->name(), scope, isValueType);
-        }
-        return isTypeValueType(type);
-    }(memberVariableType);
+    const bool isValueType = this->isValueType(memberVariableType,
+                                               data.declarationSymbol->enclosingScope());
     const FullySpecifiedType parameterType = isValueType ? memberVariableType
                                                          : makeConstRef(memberVariableType);
 
@@ -8350,6 +8405,351 @@ void RemoveUsingNamespace::match(const CppQuickFixInterface &interface, QuickFix
     }
 }
 
+namespace {
+
+class ConstructorMemberInfo
+{
+public:
+    ConstructorMemberInfo(const QString &name, Symbol *symbol)
+        : memberVariableName(name)
+        , parameterName(memberBaseName(name))
+        , symbol(symbol)
+        , type(symbol->type())
+    {}
+
+    QString memberVariableName;
+    QString parameterName;
+    bool init = true;
+    Symbol *symbol; // for the right type later
+    FullySpecifiedType type;
+};
+using ConstructorMemberCandidates = std::vector<ConstructorMemberInfo>;
+
+class ConstructorCandidateTreeItem : public Utils::TreeItem
+{
+public:
+    enum Column { ShouldInitColumn, MemberNameColumn, ParameterNameColumn };
+    ConstructorCandidateTreeItem(ConstructorMemberInfo *memberInfo)
+        : m_memberInfo(memberInfo)
+    {}
+
+private:
+    QVariant data(int column, int role) const override
+    {
+        if (role == Qt::CheckStateRole && column == ShouldInitColumn)
+            return m_memberInfo->init ? Qt::Checked : Qt::Unchecked;
+        if (role == Qt::DisplayRole && column == MemberNameColumn)
+            return m_memberInfo->memberVariableName;
+        if ((role == Qt::DisplayRole || role == Qt::EditRole) && column == ParameterNameColumn)
+            return m_memberInfo->parameterName;
+        return {};
+    }
+
+    bool setData(int column, const QVariant &data, int role) override
+    {
+        if (column == ShouldInitColumn && role == Qt::CheckStateRole) {
+            m_memberInfo->init = data.toInt() == Qt::Checked;
+            update();
+            return true;
+        }
+        if (column == ParameterNameColumn && role == Qt::EditRole) {
+            m_memberInfo->parameterName = data.toString();
+            return true;
+        }
+        return false;
+    }
+
+    Qt::ItemFlags flags(int column) const override
+    {
+        if (column == ShouldInitColumn)
+            return Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
+        if (!m_memberInfo->init)
+            return {};
+        if (column == MemberNameColumn)
+            return Qt::ItemIsEnabled;
+        if (column == ParameterNameColumn)
+            return Qt::ItemIsEnabled | Qt::ItemIsEditable;
+        return {};
+    }
+
+    ConstructorMemberInfo *const m_memberInfo;
+};
+
+class GenerateConstructorDialog : public QDialog
+{
+    Q_DECLARE_TR_FUNCTIONS(GenerateConstructorDialog)
+public:
+    GenerateConstructorDialog(const ConstructorMemberCandidates &candidates)
+        : QDialog()
+        , m_candidates(candidates)
+    {
+        setWindowTitle(tr("Constructor"));
+        const auto model = new Utils::TreeModel<Utils::TreeItem, ConstructorCandidateTreeItem>(this);
+        model->setHeader(QStringList({
+            tr("Initialize in Constructor"),
+            tr("Member Name"),
+            tr("Parameter Name"),
+        }));
+        for (auto &candidate : m_candidates)
+            model->rootItem()->appendChild(new ConstructorCandidateTreeItem(&candidate));
+        const auto view = new QTreeView(this);
+        view->setModel(model);
+        int optimalWidth = 0;
+        for (int i = 0; i < model->columnCount(QModelIndex{}); ++i) {
+            view->resizeColumnToContents(i);
+            optimalWidth += view->columnWidth(i);
+        }
+
+        const auto buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
+        connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
+        connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
+
+        // setup select all/none checkbox
+        QCheckBox *const checkBox = new QCheckBox(tr("Initialize all members"));
+        checkBox->setChecked(true);
+        connect(checkBox, &QCheckBox::stateChanged, [model](int state) {
+            if (state != Qt::PartiallyChecked) {
+                for (int i = 0; i < model->rowCount(); ++i)
+                    model->setData(model->index(i, ConstructorCandidateTreeItem::ShouldInitColumn),
+                                   state,
+                                   Qt::CheckStateRole);
+            }
+        });
+        connect(checkBox, &QCheckBox::clicked, this, [checkBox] {
+            if (checkBox->checkState() == Qt::PartiallyChecked)
+                checkBox->setCheckState(Qt::Checked);
+        });
+        connect(model, &QAbstractItemModel::dataChanged, this, [this, checkBox] {
+            const auto selectedCount = Utils::count(m_candidates,
+                                                    [](const ConstructorMemberInfo &mi) {
+                                                        return mi.init;
+                                                    });
+
+            const auto state = [this, selectedCount]() {
+                if (selectedCount == 0)
+                    return Qt::Unchecked;
+                if (static_cast<int>(m_candidates.size()) == selectedCount)
+                    return Qt::Checked;
+                return Qt::PartiallyChecked;
+            }();
+            checkBox->setCheckState(state);
+        });
+
+        using A = InsertionPointLocator::AccessSpec;
+        auto accessCombo = new QComboBox;
+        connect(accessCombo, qOverload<int>(&QComboBox::currentIndexChanged), [this, accessCombo]() {
+            const auto data = accessCombo->currentData();
+            m_accessSpec = static_cast<A>(data.toInt());
+        });
+        for (auto a : {A::Public, A::Protected, A::Private})
+            accessCombo->addItem(InsertionPointLocator::accessSpecToString(a), a);
+        const auto row = new QHBoxLayout();
+        row->addWidget(new QLabel(tr("Access") + ":"));
+        row->addWidget(accessCombo);
+        row->addSpacerItem(new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum));
+
+        const auto mainLayout = new QVBoxLayout(this);
+        mainLayout->addWidget(new QLabel(tr("Select the members "
+                                            "to be initialized in the constructor.")));
+        mainLayout->addLayout(row);
+        mainLayout->addWidget(checkBox);
+        mainLayout->addWidget(view);
+        mainLayout->addWidget(buttonBox);
+        int left, right;
+        mainLayout->getContentsMargins(&left, nullptr, &right, nullptr);
+        optimalWidth += left + right;
+        resize(optimalWidth, mainLayout->sizeHint().height());
+    }
+
+    ConstructorMemberCandidates candidates() const { return m_candidates; }
+    InsertionPointLocator::AccessSpec accessSpec() const { return m_accessSpec; }
+
+private:
+    ConstructorMemberCandidates m_candidates;
+    InsertionPointLocator::AccessSpec m_accessSpec;
+};
+
+class GenerateConstructorOperation : public CppQuickFixOperation
+{
+public:
+    GenerateConstructorOperation(const CppQuickFixInterface &interface)
+        : CppQuickFixOperation(interface)
+    {
+        setDescription(CppQuickFixFactory::tr("Generate Constructor"));
+
+        m_classAST = astForClassOperations(interface);
+        if (!m_classAST)
+            return;
+        Class *const theClass = m_classAST->symbol;
+        if (!theClass)
+            return;
+
+        // Go through all members and find member variable declarations
+        for (auto it = theClass->memberBegin(); it != theClass->memberEnd(); ++it) {
+            Symbol *const s = *it;
+            if (!s->identifier() || !s->type() || s->type().isTypedef())
+                continue;
+            if ((s->isDeclaration() && s->type()->asFunctionType()) || s->asFunction())
+                continue;
+            if (s->isDeclaration() && (s->isPrivate() || s->isProtected()) && !s->isStatic()) {
+                const auto name = QString::fromUtf8(s->identifier()->chars(),
+                                                    s->identifier()->size());
+                m_candidates.emplace_back(name, s);
+            }
+        }
+    }
+
+    ConstructorMemberCandidates &candidates() { return m_candidates; }
+    bool isApplicable() const { return !m_candidates.empty(); }
+
+    void setTest(bool isTest = true) { m_test = isTest; }
+
+private:
+    void perform() override
+    {
+        InsertionPointLocator::AccessSpec accessSpec = InsertionPointLocator::Public;
+        if (!m_test) {
+            GenerateConstructorDialog dlg(m_candidates);
+            if (dlg.exec() == QDialog::Rejected)
+                return;
+            m_candidates = dlg.candidates();
+            accessSpec = dlg.accessSpec();
+        }
+        if (m_candidates.empty())
+            return;
+        struct GenerateConstructorRefactoringHelper : public GetterSetterRefactoringHelper
+        {
+            const ClassSpecifierAST *m_classAST;
+            InsertionPointLocator::AccessSpec m_accessSpec;
+            GenerateConstructorRefactoringHelper(CppQuickFixOperation *operation,
+                                                 const QString &fileName,
+                                                 Class *clazz,
+                                                 const ClassSpecifierAST *classAST,
+                                                 InsertionPointLocator::AccessSpec accessSpec)
+                : GetterSetterRefactoringHelper(operation, fileName, clazz)
+                , m_classAST(classAST)
+                , m_accessSpec(accessSpec)
+            {}
+            void generateConstructor(ConstructorMemberCandidates candidates)
+            {
+                ConstructorMemberCandidates members = Utils::filtered(candidates,
+                                                                      [](const auto &mi) {
+                                                                          return mi.init;
+                                                                      });
+                auto constructorLocation = m_settings->determineSetterLocation(members.size());
+                if (constructorLocation == CppQuickFixSettings::FunctionLocation::CppFile
+                    && !hasSourceFile())
+                    constructorLocation = CppQuickFixSettings::FunctionLocation::OutsideClass;
+
+                Overview overview = CppCodeStyleSettings::currentProjectCodeStyleOverview();
+                overview.showTemplateParameters = true;
+
+                InsertionLocation implLoc;
+                QString implCode;
+                CppRefactoringFilePtr implFile;
+                QString className = overview.prettyName(m_class->name());
+                QStringList insertedNamespaces;
+                if (constructorLocation == CppQuickFixSettings::FunctionLocation::CppFile) {
+                    implLoc = sourceLocationFor(m_class, &insertedNamespaces);
+                    implFile = m_sourceFile;
+                    QString clazz = overview.prettyName(m_class->name());
+                    if (m_settings->rewriteTypesinCppFile())
+                        implCode = symbolAt(m_class, m_sourceFile, implLoc);
+                    else
+                        implCode = className;
+                    implCode += "::" + className + "(";
+                } else if (constructorLocation
+                           == CppQuickFixSettings::FunctionLocation::OutsideClass) {
+                    implLoc = insertLocationForMethodDefinition(m_class,
+                                                                false,
+                                                                NamespaceHandling::Ignore,
+                                                                m_changes,
+                                                                m_headerFile->fileName(),
+                                                                &insertedNamespaces);
+                    implFile = m_headerFile;
+                    implCode = symbolAt(m_class, m_headerFile, implLoc);
+                    implCode += "::" + className + "(";
+                }
+
+                QString inClassDeclaration = overview.prettyName(m_class->name()) + "(";
+                QString constructorBody = members.empty() ? ") {}" : ") : ";
+                for (auto &member : members) {
+                    bool customValueType;
+                    if (isValueType(member.symbol, &customValueType))
+                        member.type.setConst(false);
+                    else
+                        member.type = makeConstRef(member.type);
+
+                    inClassDeclaration += overview.prettyType(member.type, member.parameterName);
+                    inClassDeclaration += ", ";
+                    QString param = member.parameterName;
+                    if (customValueType)
+                        param = "std::move(" + member.parameterName + ')';
+                    constructorBody += member.memberVariableName + '(' + param + "),\n";
+                    if (implFile) {
+                        FullySpecifiedType type = typeAt(member.type,
+                                                         m_class,
+                                                         implFile,
+                                                         implLoc,
+                                                         insertedNamespaces);
+                        implCode += overview.prettyType(type, member.parameterName) + ", ";
+                    }
+                }
+                if (!members.empty()) {
+                    inClassDeclaration.resize(inClassDeclaration.length() - 2);
+                    constructorBody.remove(constructorBody.length() - 2, 1); // ..),\n => ..)\n
+                    constructorBody += "{}";
+                    if (!implCode.isEmpty())
+                        implCode.resize(implCode.length() - 2);
+                }
+                implCode += constructorBody;
+
+                if (constructorLocation == CppQuickFixSettings::FunctionLocation::InsideClass)
+                    inClassDeclaration += constructorBody;
+                else
+                    inClassDeclaration += QLatin1String(");");
+
+                TranslationUnit *tu = m_headerFile->cppDocument()->translationUnit();
+                insertAndIndent(m_headerFile,
+                                m_locator.constructorDeclarationInClass(tu,
+                                                                        m_classAST,
+                                                                        m_accessSpec,
+                                                                        members.size()),
+                                inClassDeclaration);
+
+                if (constructorLocation == CppQuickFixSettings::FunctionLocation::CppFile) {
+                    addSourceFileCode(implCode);
+                } else if (constructorLocation
+                           == CppQuickFixSettings::FunctionLocation::OutsideClass) {
+                    if (isHeaderHeaderFile())
+                        implCode.prepend("inline ");
+                    insertAndIndent(m_headerFile, implLoc, implCode);
+                }
+            }
+        };
+        GenerateConstructorRefactoringHelper helper(this,
+                                                    currentFile()->fileName(),
+                                                    m_classAST->symbol,
+                                                    m_classAST,
+                                                    accessSpec);
+        helper.generateConstructor(m_candidates);
+        helper.applyChanges();
+    }
+
+    ConstructorMemberCandidates m_candidates;
+    const ClassSpecifierAST *m_classAST = nullptr;
+    bool m_test = false;
+};
+} // namespace
+void GenerateConstructor::match(const CppQuickFixInterface &interface, QuickFixOperations &result)
+{
+    const auto op = QSharedPointer<GenerateConstructorOperation>::create(interface);
+    if (!op->isApplicable())
+        return;
+    op->setTest(m_test);
+    result << op;
+}
+
 void createCppQuickFixes()
 {
     new AddIncludeForUndefinedIdentifier;
@@ -8406,6 +8806,7 @@ void createCppQuickFixes()
     new ExtraRefactoringOperations;
 
     new RemoveUsingNamespace;
+    new GenerateConstructor;
 }
 
 void destroyCppQuickFixes()

src/plugins/cppeditor/cppquickfixes.h

@@ -590,5 +590,20 @@ public:
     void match(const CppQuickFixInterface &interface, TextEditor::QuickFixOperations &result) override;
 };
 
+/*!
+  Generate constructor
+ */
+class GenerateConstructor : public CppQuickFixFactory
+{
+protected:
+    void setTest() { m_test = true; }
+
+private:
+    void match(const CppQuickFixInterface &interface,
+               TextEditor::QuickFixOperations &result) override;
+
+    bool m_test = false;
+};
+
 } // namespace Internal
 } // namespace CppEditor

src/plugins/cpptools/insertionpointlocator.cpp

@@ -60,6 +60,7 @@ static int ordering(InsertionPointLocator::AccessSpec xsSpec)
 struct AccessRange
 {
     int start = 0;
+    int beforeStart = 0;
     unsigned end = 0;
     InsertionPointLocator::AccessSpec xsSpec = InsertionPointLocator::Invalid;
     unsigned colonToken = 0;
@@ -81,16 +82,14 @@ struct AccessRange
 class FindInClass: public ASTVisitor
 {
 public:
-    FindInClass(const Document::Ptr &doc, const Class *clazz, InsertionPointLocator::AccessSpec xsSpec)
-        : ASTVisitor(doc->translationUnit())
-        , _doc(doc)
+    FindInClass(TranslationUnit *tu, const Class *clazz)
+        : ASTVisitor(tu)
         , _clazz(clazz)
-        , _xsSpec(xsSpec)
     {}
 
-    InsertionLocation operator()()
+    ClassSpecifierAST *operator()()
     {
-        _result = InsertionLocation();
+        _result = nullptr;
 
         AST *ast = translationUnit()->ast();
         accept(ast);
@@ -107,39 +106,18 @@ protected:
             return true;
         if (!ast->symbol || !ast->symbol->match(_clazz))
             return true;
-
-        QList<AccessRange> ranges = collectAccessRanges(
-                    ast->member_specifier_list,
-                    tokenKind(ast->classkey_token) == T_CLASS ? InsertionPointLocator::Private : InsertionPointLocator::Public,
-                    ast->lbrace_token,
-                    ast->rbrace_token);
-
-        unsigned beforeToken = 0;
-        bool needsLeadingEmptyLine = false;
-        bool needsPrefix = false;
-        bool needsSuffix = false;
-        findMatch(ranges, _xsSpec, beforeToken, needsLeadingEmptyLine, needsPrefix, needsSuffix);
-
-        int line = 0, column = 0;
-        getTokenStartPosition(beforeToken, &line, &column);
-
-        QString prefix;
-        if (needsLeadingEmptyLine)
-            prefix += QLatin1String("\n");
-        if (needsPrefix)
-            prefix += InsertionPointLocator::accessSpecToString(_xsSpec) + QLatin1String(":\n");
-
-        QString suffix;
-        if (needsSuffix)
-            suffix = QLatin1Char('\n');
-
-        _result = InsertionLocation(_doc->fileName(), prefix, suffix,
-                                    line, column);
+        _result = ast;
         return false;
     }
 
-    static void findMatch(const QList<AccessRange> &ranges,
+private:
+    const Class *_clazz;
+    ClassSpecifierAST *_result;
+};
+
+void findMatch(const QList<AccessRange> &ranges,
                InsertionPointLocator::AccessSpec xsSpec,
+               InsertionPointLocator::Position positionInAccessSpec,
                unsigned &beforeToken,
                bool &needsLeadingEmptyLine,
                bool &needsPrefix,
@@ -147,14 +125,15 @@ protected:
 {
     QTC_ASSERT(!ranges.isEmpty(), return );
     const int lastIndex = ranges.size() - 1;
-
+    const bool atEnd = positionInAccessSpec == InsertionPointLocator::AccessSpecEnd;
     needsLeadingEmptyLine = false;
 
     // try an exact match, and ignore the first (default) access spec:
     for (int i = lastIndex; i > 0; --i) {
         const AccessRange &range = ranges.at(i);
         if (range.xsSpec == xsSpec) {
-                beforeToken = range.end;
+            beforeToken = atEnd ? range.end : range.beforeStart;
+            needsLeadingEmptyLine = !atEnd;
             needsPrefix = false;
             needsSuffix = (i != lastIndex);
             return;
@@ -166,7 +145,8 @@ protected:
         const AccessRange &current = ranges.at(i);
 
         if (ordering(xsSpec) > ordering(current.xsSpec)) {
-                beforeToken = current.end;
+            beforeToken = atEnd ? current.end : current.end - 1;
+            needsLeadingEmptyLine = !atEnd;
             needsPrefix = true;
             needsSuffix = (i != lastIndex);
             return;
@@ -174,16 +154,17 @@ protected:
     }
 
     // otherwise:
-        beforeToken = ranges.first().end;
+    beforeToken = atEnd ? ranges.first().end : ranges.first().end - 1;
     needsLeadingEmptyLine = !ranges.first().isEmpty();
     needsPrefix = true;
     needsSuffix = (ranges.size() != 1);
 }
 
-    QList<AccessRange> collectAccessRanges(DeclarationListAST *decls,
+QList<AccessRange> collectAccessRanges(const CPlusPlus::TranslationUnit *tu,
+                                       DeclarationListAST *decls,
                                        InsertionPointLocator::AccessSpec initialXs,
                                        int firstRangeStart,
-                                           int lastRangeEnd) const
+                                       int lastRangeEnd)
 {
     QList<AccessRange> ranges;
     ranges.append(AccessRange(firstRangeStart, lastRangeEnd, initialXs, 0));
@@ -194,10 +175,9 @@ protected:
         if (AccessDeclarationAST *xsDecl = decl->asAccessDeclaration()) {
             const unsigned token = xsDecl->access_specifier_token;
             InsertionPointLocator::AccessSpec newXsSpec = initialXs;
-                bool isSlot = xsDecl->slots_token
-                        && tokenKind(xsDecl->slots_token) == T_Q_SLOTS;
+            bool isSlot = xsDecl->slots_token && tu->tokenKind(xsDecl->slots_token) == T_Q_SLOTS;
 
-                switch (tokenKind(token)) {
+            switch (tu->tokenKind(token)) {
             case T_PUBLIC:
                 newXsSpec = isSlot ? InsertionPointLocator::PublicSlot
                                    : InsertionPointLocator::Public;
@@ -218,8 +198,8 @@ protected:
                 break;
 
             case T_Q_SLOTS: {
-                    newXsSpec = (InsertionPointLocator::AccessSpec)
-                            (ranges.last().xsSpec | InsertionPointLocator::SlotBit);
+                newXsSpec = (InsertionPointLocator::AccessSpec)(ranges.last().xsSpec
+                                                                | InsertionPointLocator::SlotBit);
                 break;
             }
 
@@ -230,6 +210,7 @@ protected:
             if (newXsSpec != ranges.last().xsSpec || ranges.size() == 1) {
                 ranges.last().end = token;
                 AccessRange r(token, lastRangeEnd, newXsSpec, xsDecl->colon_token);
+                r.beforeStart = xsDecl->lastToken() - 1;
                 ranges.append(r);
             }
         }
@@ -239,14 +220,6 @@ protected:
     return ranges;
 }
 
-private:
-    Document::Ptr _doc;
-    const Class *_clazz;
-    InsertionPointLocator::AccessSpec _xsSpec;
-
-    InsertionLocation _result;
-};
-
 } // end of anonymous namespace
 
 InsertionLocation::InsertionLocation() = default;
@@ -301,13 +274,118 @@ InsertionLocation InsertionPointLocator::methodDeclarationInClass(
 {
     const Document::Ptr doc = m_refactoringChanges.file(fileName)->cppDocument();
     if (doc) {
-        FindInClass find(doc, clazz, xsSpec);
-        return find();
+        FindInClass find(doc->translationUnit(), clazz);
+        ClassSpecifierAST *classAST = find();
+        return methodDeclarationInClass(doc->translationUnit(), classAST, xsSpec);
     } else {
         return InsertionLocation();
     }
 }
 
+InsertionLocation InsertionPointLocator::methodDeclarationInClass(
+    const TranslationUnit *tu,
+    const ClassSpecifierAST *clazz,
+    InsertionPointLocator::AccessSpec xsSpec,
+    Position pos) const
+{
+    if (!clazz)
+        return {};
+    QList<AccessRange> ranges = collectAccessRanges(tu,
+                                                    clazz->member_specifier_list,
+                                                    tu->tokenKind(clazz->classkey_token) == T_CLASS
+                                                        ? InsertionPointLocator::Private
+                                                        : InsertionPointLocator::Public,
+                                                    clazz->lbrace_token,
+                                                    clazz->rbrace_token);
+
+    unsigned beforeToken = 0;
+    bool needsLeadingEmptyLine = false;
+    bool needsPrefix = false;
+    bool needsSuffix = false;
+    findMatch(ranges, xsSpec, pos, beforeToken, needsLeadingEmptyLine, needsPrefix, needsSuffix);
+
+    int line = 0, column = 0;
+    if (pos == InsertionPointLocator::AccessSpecEnd)
+        tu->getTokenStartPosition(beforeToken, &line, &column);
+    else
+        tu->getTokenEndPosition(beforeToken, &line, &column);
+
+    QString prefix;
+    if (needsLeadingEmptyLine)
+        prefix += QLatin1String("\n");
+    if (needsPrefix)
+        prefix += InsertionPointLocator::accessSpecToString(xsSpec) + QLatin1String(":\n");
+
+    QString suffix;
+    if (needsSuffix)
+        suffix = QLatin1Char('\n');
+    const QString fileName = QString::fromUtf8(tu->fileName(), tu->fileNameLength());
+    return InsertionLocation(fileName, prefix, suffix, line, column);
+}
+
+InsertionPointLocator::AccessSpec symbolsAccessSpec(Symbol *symbol)
+{
+    if (symbol->isPrivate())
+        return InsertionPointLocator::Private;
+    if (symbol->isProtected())
+        return InsertionPointLocator::Protected;
+    if (symbol->isPublic())
+        return InsertionPointLocator::Public;
+    return InsertionPointLocator::Invalid;
+}
+
+InsertionLocation InsertionPointLocator::constructorDeclarationInClass(
+    const CPlusPlus::TranslationUnit *tu,
+    const ClassSpecifierAST *clazz,
+    InsertionPointLocator::AccessSpec xsSpec,
+    int constructorArgumentCount) const
+{
+    std::map<int, std::pair<DeclarationAST *, DeclarationAST *>> constructors;
+    for (DeclarationAST *rootDecl : clazz->member_specifier_list) {
+        if (SimpleDeclarationAST *ast = rootDecl->asSimpleDeclaration()) {
+            if (!ast->symbols)
+                continue;
+            if (symbolsAccessSpec(ast->symbols->value) != xsSpec)
+                continue;
+            if (ast->symbols->value->name() != clazz->name->name)
+                continue;
+            for (DeclaratorAST *d : ast->declarator_list) {
+                for (PostfixDeclaratorAST *decl : d->postfix_declarator_list) {
+                    if (FunctionDeclaratorAST *func = decl->asFunctionDeclarator()) {
+                        int params = 0;
+                        if (func->parameter_declaration_clause) {
+                            params = size(
+                                func->parameter_declaration_clause->parameter_declaration_list);
+                        }
+                        auto &entry = constructors[params];
+                        if (!entry.first)
+                            entry.first = rootDecl;
+                        entry.second = rootDecl;
+                    }
+                }
+            }
+        }
+    }
+    if (constructors.empty())
+        return methodDeclarationInClass(tu, clazz, xsSpec, AccessSpecBegin);
+
+    auto iter = constructors.lower_bound(constructorArgumentCount);
+    if (iter == constructors.end()) {
+        // we have a constructor with x arguments but there are only ones with < x arguments
+        --iter; // select greatest one (in terms of argument count)
+    }
+    const QString fileName = QString::fromUtf8(tu->fileName(), tu->fileNameLength());
+    int line, column;
+    if (iter->first <= constructorArgumentCount) {
+        tu->getTokenEndPosition(iter->second.second->lastToken() - 1, &line, &column);
+        return InsertionLocation(fileName, "\n", "", line, column);
+    }
+    // before iter
+    // end pos of firstToken-1 instead of start pos of firstToken to skip leading commend
+    tu->getTokenEndPosition(iter->second.first->firstToken() - 1, &line, &column);
+    return InsertionLocation(fileName, "\n", "", line, column);
+}
+
 namespace {
 template <class Key, class Value>
 class HighestValue

src/plugins/cpptools/insertionpointlocator.h

@@ -86,6 +86,11 @@ public:
     };
     static QString accessSpecToString(InsertionPointLocator::AccessSpec xsSpec);
 
+    enum Position {
+        AccessSpecBegin,
+        AccessSpecEnd,
+    };
+
 public:
     explicit InsertionPointLocator(const CppRefactoringChanges &refactoringChanges);
 
@@ -93,6 +98,16 @@ public:
                                                const CPlusPlus::Class *clazz,
                                                AccessSpec xsSpec) const;
 
+    InsertionLocation methodDeclarationInClass(const CPlusPlus::TranslationUnit *tu,
+                                               const CPlusPlus::ClassSpecifierAST *clazz,
+                                               AccessSpec xsSpec,
+                                               Position positionInAccessSpec = AccessSpecEnd) const;
+
+    InsertionLocation constructorDeclarationInClass(const CPlusPlus::TranslationUnit *tu,
+                                                    const CPlusPlus::ClassSpecifierAST *clazz,
+                                                    AccessSpec xsSpec,
+                                                    int constructorArgumentCount) const;
+
     const QList<InsertionLocation> methodDefinition(
             CPlusPlus::Symbol *declaration,
             bool useSymbolFinder = true,