NGWS SDK Documentation  

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Compiler Error C2675

unary 'operator' : 'type' does not define this operator or a conversion to a type acceptable to the predefined operator

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();
} c;

class D
{
   public:
   D();
   operator !();
} d;

void main()
{
   !c;   // error
   !d;    // OK, operator !() defined
}