Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/libs/cplusplus/AlreadyConsideredClassContainer.h

@@ -26,7 +26,7 @@ public:
             return true;
 
         SafeMatcher matcher;
-        for (const T *existingItem : qAsConst(_container)) {
+        for (const T *existingItem : std::as_const(_container)) {
             if (Matcher::match(existingItem, item, &matcher))
                 return true;
         }

src/libs/cplusplus/CppDocument.cpp

@@ -299,7 +299,7 @@ void Document::setLastModified(const QDateTime &lastModified)
 QStringList Document::includedFiles() const
 {
     QStringList files;
-    for (const Include &i : qAsConst(_resolvedIncludes))
+    for (const Include &i : std::as_const(_resolvedIncludes))
         files.append(i.resolvedFileName());
     files.removeDuplicates();
     return files;
@@ -488,7 +488,7 @@ Symbol *Document::lastVisibleSymbolAt(int line, int column) const
 
 const Macro *Document::findMacroDefinitionAt(int line) const
 {
-    for (const Macro &macro : qAsConst(_definedMacros)) {
+    for (const Macro &macro : std::as_const(_definedMacros)) {
         if (macro.line() == line)
             return &macro;
     }
@@ -497,7 +497,7 @@ const Macro *Document::findMacroDefinitionAt(int line) const
 
 const Document::MacroUse *Document::findMacroUseAt(int utf16charsOffset) const
 {
-    for (const Document::MacroUse &use : qAsConst(_macroUses)) {
+    for (const Document::MacroUse &use : std::as_const(_macroUses)) {
         if (use.containsUtf16charOffset(utf16charsOffset)
                 && (utf16charsOffset < use.utf16charsBegin() + use.macro().nameToQString().size())) {
             return &use;
@@ -508,7 +508,7 @@ const Document::MacroUse *Document::findMacroUseAt(int utf16charsOffset) const
 
 const Document::UndefinedMacroUse *Document::findUndefinedMacroUseAt(int utf16charsOffset) const
 {
-    for (const Document::UndefinedMacroUse &use : qAsConst(_undefinedMacroUses)) {
+    for (const Document::UndefinedMacroUse &use : std::as_const(_undefinedMacroUses)) {
         if (use.containsUtf16charOffset(utf16charsOffset)
                 && (utf16charsOffset < use.utf16charsBegin()
                     + QString::fromUtf8(use.name(), use.name().size()).length()))

src/libs/cplusplus/FindUsages.cpp

@@ -399,7 +399,7 @@ private:
                 if (!klass) {
                     if (const auto namedType = baseExprType->asNamedType()) {
                         items = context.lookup(namedType->name(), item->scope());
-                        for (const LookupItem &item : qAsConst(items)) {
+                        for (const LookupItem &item : std::as_const(items)) {
                             if ((klass = item.type()->asClassType()))
                                 break;
                         }
@@ -410,7 +410,7 @@ private:
                 items = context.lookup(memberAccess->member_name->name, klass);
                 if (items.isEmpty())
                     return Usage::Type::Other;
-                for (const LookupItem &item : qAsConst(items)) {
+                for (const LookupItem &item : std::as_const(items)) {
                     if (item.type()->asFunctionType()) {
                         if (item.type().isConst())
                             return Usage::Type::Read;

src/libs/cplusplus/LookupContext.cpp

@@ -1357,7 +1357,7 @@ ClassOrNamespace *ClassOrNamespace::nestedType(const Name *name,
             for (int i = 0; i < argumentCountOfSpecialization; ++i)
                 templParams.insert(templateSpecialization->templateParameterAt(i)->name(), i);
 
-            for (const Name *baseName : qAsConst(allBases)) {
+            for (const Name *baseName : std::as_const(allBases)) {
                 ClassOrNamespace *baseBinding = nullptr;
 
                 if (const Identifier *nameId = baseName->asNameId()) {
@@ -1435,7 +1435,7 @@ ClassOrNamespace *ClassOrNamespace::nestedType(const Name *name,
 
     // Find the missing bases for regular (non-template) types.
     // Ex.: class A : public B<Some>::Type {};
-    for (const Name *baseName : qAsConst(allBases)) {
+    for (const Name *baseName : std::as_const(allBases)) {
         ClassOrNamespace *binding = this;
         if (const QualifiedNameId *qBaseName = baseName->asQualifiedNameId()) {
             if (const Name *qualification = qBaseName->base())

src/libs/cplusplus/Macro.cpp

@@ -47,7 +47,7 @@ QString Macro::decoratedName() const
     if (f._functionLike) {
         text += QLatin1Char('(');
         bool first = true;
-        for (const QByteArray &formal : qAsConst(_formals)) {
+        for (const QByteArray &formal : std::as_const(_formals)) {
             if (! first)
                 text += QLatin1String(", ");
             else

src/libs/cplusplus/MatchingText.cpp

@@ -522,7 +522,7 @@ QString MatchingText::insertMatchingBrace(const QTextCursor &cursor, const QStri
     }
 
     QString result;
-    for (const QChar &ch : qAsConst(text)) {
+    for (const QChar &ch : std::as_const(text)) {
         if      (ch == QLatin1Char('('))  result += QLatin1Char(')');
         else if (ch == QLatin1Char('['))  result += QLatin1Char(']');
         else if (ch == QLatin1Char('{'))  result += QLatin1Char('}');