Library: General utilities
pointer_to_unary_function unary_function
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