pointer_to_unary_function

Module:  Standard C++ Library   Library:  General utilities

pointer_to_unary_function  unary_function

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A function object class that adapts a pointer to a function, to take the place of a unary_function

#include <functional>

namespace std {
  template <class Arg, class Result>
  class pointer_to_unary_function;
}

The pointer_to_unary_function class encapsulates a pointer to a single-argument function. The class uses operator() so that the resulting object serves as a function object for that function.

The ptr_fun function is overloaded to create instances of pointer_to_unary_function when included with the appropriate pointer to a function.

namespace std {

  template <class Arg, class Result>
  class pointer_to_unary_function : public 
        unary_function<Arg, Result> {

    public:
    explicit pointer_to_unary_function (Result (*f)(Arg));
    Result operator() (const Arg&) const;
  };
}

Function Objects, pointer_to_binary_function, ptr_fun(), unary_function

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.7

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