CppEditor: Support decl/def switch for conversion operators

Fixes: QTCREATORBUG-21168
Change-Id: I515fe146a679e007c96fa8d23f1457dadf07db3c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/3rdparty/cplusplus/Control.cpp

@@ -579,6 +579,15 @@ const OperatorNameId *Control::findOperatorNameId(OperatorNameId::Kind operatorI
         return &*i;
 }
 
+const ConversionNameId *Control::findConversionNameId(const FullySpecifiedType &type) const
+{
+    for (const ConversionNameId &id : d->conversionNameIds) {
+        if (type.match(id.type()))
+            return &id;
+    }
+    return nullptr;
+}
+
 const Identifier *Control::findIdentifier(const char *chars, int size) const
 { return d->identifiers.findLiteral(chars, size); }
 

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

@@ -186,6 +186,7 @@ public:
     const Identifier *cpp11Final() const;
 
     const OperatorNameId *findOperatorNameId(OperatorNameId::Kind operatorId) const;
+    const ConversionNameId *findConversionNameId(const FullySpecifiedType &type) const;
 
     const Identifier *findIdentifier(const char *chars, int size) const;
     const Identifier *identifier(const char *chars, int size);

src/libs/3rdparty/cplusplus/Scope.cpp

@@ -71,6 +71,7 @@ public:
 
     Symbol *lookat(const Identifier *id) const;
     Symbol *lookat(OperatorNameId::Kind operatorId) const;
+    Symbol *lookat(const ConversionNameId *convId) const;
 
 private:
     /// Returns the hash value for the given Symbol.
@@ -181,6 +182,23 @@ Symbol *SymbolTable::lookat(OperatorNameId::Kind operatorId) const
     return symbol;
 }
 
+Symbol *SymbolTable::lookat(const ConversionNameId *convId) const
+{
+    if (!_hash)
+        return nullptr;
+
+    Symbol *symbol = _hash[0]; // See Symbol::HashCode
+    for (; symbol; symbol = symbol->_next) {
+        if (const Name *identity = symbol->unqualifiedName()) {
+            if (const ConversionNameId * const id = identity->asConversionNameId()) {
+                if (id->type().match(convId->type()))
+                    break;
+            }
+        }
+    }
+    return symbol;
+}
+
 void SymbolTable::rehash()
 {
     _hashSize <<= 1;
@@ -281,6 +299,9 @@ Symbol *Scope::find(const Identifier *id) const
 Symbol *Scope::find(OperatorNameId::Kind operatorId) const
 { return _members ? _members->lookat(operatorId) : nullptr; }
 
+Symbol *Scope::find(const ConversionNameId *conv) const
+{ return _members ? _members->lookat(conv) : nullptr; }
+
 /// Set the start offset of the scope
 int Scope::startOffset() const
 { return _startOffset; }

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

@@ -55,6 +55,7 @@ public:
 
     Symbol *find(const Identifier *id) const;
     Symbol *find(OperatorNameId::Kind operatorId) const;
+    Symbol *find(const ConversionNameId *conv) const;
 
     /// Set the start offset of the scope
     int startOffset() const;