pointer_to_unary_function 클래스
적응 가능한 단항 함수는 단항 함수 포인터로 변환합니다.
template<class Arg, class Result>
class pointer_to_unary_function
: public unary_function<Arg, Result>
{
public:
explicit pointer_to_unary_function(
Result (*_pfunc)(Arg)
);
Result operator()(
Arg _Left
) const;
};
매개 변수
_pfunc
The binary function to be converted._Left
The object that the *_pfunc is called on.
반환 값
The template class stores a copy of _pfunc. It defines its member function operator() as returning (*_pfunc)(_Left).
설명
A unary function pointer is a function object and may be passed to any Standard Template Library algorithm that is expecting a unary 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 argument_type and result_type that make such an adaptation possible. The conversion by pointer_to_unary_function allows the function adaptors to work with binary function pointers.
예제
The constructor of pointer_to_unary_function is rarely used directly. See the helper function ptr_fun for an example of how to declare and use the pointer_to_unary_function adaptor predicate.
요구 사항
헤더: <기능>
네임스페이스: std