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pointer_to_binary_function

Converts a binary function pointer into an adaptable binary function.

template<class Arg1, class Arg2, class Result>
   class pointer_to_binary_function 
   : public binary_function <Arg1, Arg2, Result> 
   {
   public:
   explicit pointer_to_binary_function(
      Result ( _*pfunc )( Arg1, Arg2 ) 
      );
      Result operator()(
         const Arg1 _Left, 
         const Arg2 _Right
      ) const;
   };

Parameters

_*pfunc
The binary function to be converted.
_Left
The left object that the *pfunc is called on.
_Right
The right object that the *pfunc is called on.

Return Value

The template class stores a copy of pfunc. It defines its member function operator() as returning (*pfunc)(_Left, _Right).

Remarks

A binary function pointer is a function object and may be passed to any Standard Template Library algorithm that is expecting a binary function as a parameter, but it is not adaptable. To use it with an adaptor, such as binding a value to it or using it with a negator, it must be supplied with the nested types first_argument_type, second_argument_type, and result_type that make such an adaptation possible. The conversion by pointer_to_binary_function allows the function adaptors to work with binary function pointers.

Example

The constructor of pointer_to_binary_function is rarely used directly. See the helper function ptr_fun for an example of how to declare and use the pointer_to_binary_function adaptor predicate.

See Also

<functional> Members

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