NGWS SDK Documentation  

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Compiler Error C2678

binary 'operator' : no operator defined which takes a left-hand operand of type 'type' (or there is no acceptable conversion)

To use the operator, you must overload it for the specified type or define a conversion to a type for which the operator is defined. If you encounter this error while porting code from Visual C++ 2.0 or earlier, see Technote: Improved Conformance to ANSI C++.

Example

class   C
{
   public: C();
};

void main()
{
   C   aC;
   aC + 12;      // error
   }