Fix compilation issues with C++17

Testable on Linux/macOS by changing c++14 to c++1z in qtcreator.pri.
Testable with latest MSVC2017 by setting _CL_=/std:c++17.

unary_function, binary_function, and a few other things that were
deprecated are removed in C++17.
std::string got a non-const overload for its "data" member function,
so we cannot create a function pointer on it without specifying its
type. Use std::declval instead (though it requires a default constructor
for the type).

MSVC seems to have an issue with Utils::transform for std::vector
(used in Nim plugin), but that looks like a compiler issue.

Change-Id: I94f9a93d591d55b610f86fabfc618158927d6221
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/libs/3rdparty/botan/botan.cpp

@@ -465,7 +465,7 @@ inline V search_map(const std::map<K, V>& mapping,
 * Function adaptor for delete operation
 */
 template<class T>
-class del_fun : public std::unary_function<T, void>
+class del_fun
    {
    public:
       void operator()(T* ptr) { delete ptr; }

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

@@ -59,7 +59,7 @@ public:
     bool match(const Name *other, Matcher *matcher = 0) const;
 
 public:
-    struct Compare: std::binary_function<const Name *, const Name *, bool> {
+    struct Compare {
         bool operator()(const Name *name, const Name *other) const;
     };
 

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

@@ -101,7 +101,7 @@ public:
     bool isSpecialization() const { return _isSpecialization; }
 
     // Comparator needed to distinguish between two different TemplateNameId(e.g.:used in std::map)
-    struct Compare: std::binary_function<const TemplateNameId *, const TemplateNameId *, bool> {
+    struct Compare {
         bool operator()(const TemplateNameId *name, const TemplateNameId *other) const;
     };
 

src/libs/glsl/glslengine.h

@@ -71,7 +71,7 @@ template <typename Type>
 class TypeTable
 {
 public:
-    struct Compare: std::binary_function<Type, Type, bool> {
+    struct Compare {
         bool operator()(const Type &value, const Type &other) const {
             return value.isLessThan(&other);
         }

src/libs/qtcreatorcdbext/containers.cpp

@@ -245,7 +245,7 @@ AbstractSymbolGroupNodePtrVector linkedListChildList(SymbolGroupValue headNode,
 }
 
 // Helper function for linkedListChildList that returns a member by name
-class MemberByName : public std::unary_function<const SymbolGroupValue &, SymbolGroupValue>
+class MemberByName
 {
 public:
     explicit MemberByName(const char *name) : m_name(name) {}

src/libs/qtcreatorcdbext/stringutils.h

@@ -52,7 +52,7 @@ void split(const std::string &s, char sep, Iterator it)
 
 // A boolean predicate that can be used for grepping sequences
 // of strings for a 'needle' substring.
-class SubStringPredicate : public std::unary_function<const std::string &, bool>
+class SubStringPredicate
 {
 public:
     explicit SubStringPredicate(const char *needle) : m_needle(needle) {}

src/libs/qtcreatorcdbext/symbolgroup.cpp

@@ -251,7 +251,7 @@ std::string SymbolGroup::debug(const std::string &iname,
 
 typedef std::pair<unsigned, std::string> InamePathEntry;
 
-struct InamePathEntryLessThan : public std::binary_function<InamePathEntry, InamePathEntry, bool> {
+struct InamePathEntryLessThan
     bool operator()(const InamePathEntry &i1, const InamePathEntry& i2) const
     {
         if (i1.first < i2.first)

src/libs/utils/smallstringview.h

@@ -39,9 +39,7 @@ using enable_if_has_char_data_pointer = typename std::enable_if_t<
                                             std::is_same<
                                                 std::remove_const_t<
                                                     std::remove_pointer_t<
-                                                        std::result_of_t<
+                                                        decltype(std::declval<const String>().data())
-                                                            decltype(&String::data)(String)
-                                                            >
                                                         >
                                                     >, char>::value
                                             , int>;

src/plugins/cpptools/cppfindreferences.cpp

@@ -168,7 +168,7 @@ static QList<QByteArray> fullIdForSymbol(CPlusPlus::Symbol *symbol)
 
 namespace {
 
-class ProcessFile: public std::unary_function<QString, QList<CPlusPlus::Usage> >
+class ProcessFile
 {
     const WorkingCopy workingCopy;
     const CPlusPlus::Snapshot snapshot;
@@ -177,6 +177,10 @@ class ProcessFile: public std::unary_function<QString, QList<CPlusPlus::Usage> >
     QFutureInterface<CPlusPlus::Usage> *future;
 
 public:
+    // needed by QtConcurrent
+    using argument_type = const Utils::FileName &;
+    using result_type = QList<CPlusPlus::Usage>;
+
     ProcessFile(const WorkingCopy &workingCopy,
                 const CPlusPlus::Snapshot snapshot,
                 CPlusPlus::Document::Ptr symbolDocument,
@@ -230,7 +234,7 @@ public:
     }
 };
 
-class UpdateUI: public std::binary_function<QList<CPlusPlus::Usage> &, QList<CPlusPlus::Usage>, void>
+class UpdateUI
 {
     QFutureInterface<CPlusPlus::Usage> *future;
 
@@ -596,7 +600,7 @@ static void searchFinished(SearchResult *search, QFutureWatcher<CPlusPlus::Usage
 
 namespace {
 
-class FindMacroUsesInFile: public std::unary_function<QString, QList<CPlusPlus::Usage> >
+class FindMacroUsesInFile
 {
     const WorkingCopy workingCopy;
     const CPlusPlus::Snapshot snapshot;
@@ -604,6 +608,10 @@ class FindMacroUsesInFile: public std::unary_function<QString, QList<CPlusPlus::
     QFutureInterface<CPlusPlus::Usage> *future;
 
 public:
+    // needed by QtConcurrent
+    using argument_type = const Utils::FileName &;
+    using result_type = QList<CPlusPlus::Usage>;
+
     FindMacroUsesInFile(const WorkingCopy &workingCopy,
                         const CPlusPlus::Snapshot snapshot,
                         const CPlusPlus::Macro &macro,

src/plugins/qmljseditor/qmljsfindreferences.cpp

@@ -683,7 +683,7 @@ static QString matchingLine(unsigned position, const QString &source)
     return source.mid(start, end - start);
 }
 
-class ProcessFile: public std::unary_function<QString, QList<FindReferences::Usage> >
+class ProcessFile
 {
     ContextPtr context;
     typedef FindReferences::Usage Usage;
@@ -692,6 +692,10 @@ class ProcessFile: public std::unary_function<QString, QList<FindReferences::Usa
     QFutureInterface<Usage> *future;
 
 public:
+    // needed by QtConcurrent
+    using argument_type = const QString &;
+    using result_type = QList<Usage>;
+
     ProcessFile(const ContextPtr &context,
                 QString name,
                 const ObjectValue *scope,
@@ -721,7 +725,7 @@ public:
     }
 };
 
-class SearchFileForType: public std::unary_function<QString, QList<FindReferences::Usage> >
+class SearchFileForType
 {
     ContextPtr context;
     typedef FindReferences::Usage Usage;
@@ -730,6 +734,10 @@ class SearchFileForType: public std::unary_function<QString, QList<FindReference
     QFutureInterface<Usage> *future;
 
 public:
+    // needed by QtConcurrent
+    using argument_type = const QString &;
+    using result_type = QList<Usage>;
+
     SearchFileForType(const ContextPtr &context,
                       QString name,
                       const ObjectValue *scope,
@@ -759,12 +767,17 @@ public:
     }
 };
 
-class UpdateUI: public std::binary_function<QList<FindReferences::Usage> &, QList<FindReferences::Usage>, void>
+class UpdateUI
 {
     typedef FindReferences::Usage Usage;
     QFutureInterface<Usage> *future;
 
 public:
+    // needed by QtConcurrent
+    using first_argument_type = QList<Usage> &;
+    using second_argument_type = const QList<Usage> &;
+    using result_type = void;
+
     UpdateUI(QFutureInterface<Usage> *future): future(future) {}
 
     void operator()(QList<Usage> &, const QList<Usage> &usages)

src/plugins/texteditor/behaviorsettingswidget.cpp

@@ -59,7 +59,7 @@ BehaviorSettingsWidget::BehaviorSettingsWidget(QWidget *parent)
     QList<int> mibs = QTextCodec::availableMibs();
     Utils::sort(mibs);
     QList<int>::iterator firstNonNegative =
-        std::find_if(mibs.begin(), mibs.end(), std::bind2nd(std::greater_equal<int>(), 0));
+        std::find_if(mibs.begin(), mibs.end(), [](int n) { return n >=0; });
     if (firstNonNegative != mibs.end())
         std::rotate(mibs.begin(), firstNonNegative, mibs.end());
     foreach (int mib, mibs) {

src/plugins/texteditor/generichighlighter/rule.cpp

@@ -144,7 +144,9 @@ bool Rule::charPredicateMatchSucceed(const QString &text,
                                      ProgressData *progress,
                                      bool (QChar::* predicate)() const) const
 {
-    return predicateMatchSucceed(text, length, progress, std::mem_fun_ref(predicate));
+    return predicateMatchSucceed(text, length, progress, [predicate](const QChar &c) {
+        return (c.*predicate)();
+    });
 }
 
 bool Rule::charPredicateMatchSucceed(const QString &text,
@@ -152,7 +154,9 @@ bool Rule::charPredicateMatchSucceed(const QString &text,
                                      ProgressData *progress,
                                      bool (*predicate)(const QChar &)) const
 {
-    return predicateMatchSucceed(text, length, progress, std::ptr_fun(predicate));
+    return predicateMatchSucceed(text, length, progress, [predicate](const QChar &c) {
+        return predicate(c);
+    });
 }
 
 bool Rule::matchSucceed(const QString &text, const int length, ProgressData *progress)