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Compiler Error C2296

'operator' : bad left operand

The left operand used with operator is invalid.

For example, the compiler may see a declaration where you intended a function call.

The following sample generates C2296:

// C2296.cpp
struct MyStruct {
   struct Help {
      Help(float f) : m_f(f) {}
      float m_f;
   };
 
   MyStruct(const Help &h) : m_f(h.m_f) {}
   MyStruct(float f) : m_f(f) {}
   MyStruct operator*(const MyStruct &f1) const { 
      return MyStruct(m_f * f1.m_f);
   }
 
private:
   float m_f;
};
 
int main() {
   float f1 = 1.0f;
 
   MyStruct m_MyStruct1 ( MyStruct::Help( f1 ) );
   // try the following line instead
   // MyStruct m_MyStruct1 = MyStruct::Help( f1 );

   MyStruct m_MyStruct2 ( MyStruct::Help( f1 ) );
   // try the following line instead
   // MyStruct m_MyStruct2 = MyStruct::Help( f1 );
 
   MyStruct m_MyStruct3 = m_MyStruct1 * m_MyStruct2;   // C2296
}
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