adaptors for pointers to functions(3)
NAME
Adaptors for pointers to functions
Detailed Description
The advantage of function objects over pointers to functions is that
the objects in the standard library declare nested typedefs describing
their argument and result types with uniform names (e.g., result_type
from the base classes unary_function and binary_function). Sometimes
those typedefs are required, not just optional.
Adaptors are provided to turn pointers to unary (single-argument) and
binary (double-argument) functions into function objects. The longwinded functor pointer_to_unary_function is constructed with a function
pointer f, and its operator() called with argument x returns f(x). The
functor pointer_to_binary_function does the same thing, but with a
double-argument f and operator().
- The function ptr_fun takes a pointer-to-function f and constructs an
instance of the appropriate functor. - Classes
- class std::pointer_to_binary_function< _Arg1, _Arg2, _Result >
One of the adaptors for function pointers.
- class std::pointer_to_unary_function< _Arg, _Result >
One of the adaptors for function pointers.
- Functions
- template<typename _Arg1, typename _Arg2, typename _Result>
pointer_to_binary_function< _Arg1, _Arg2, _Result > std::ptr_fun (_Result(*__x)(_Arg1, _Arg2))
- template<typename _Arg, typename _Result> pointer_to_unary_function<
_Arg, _Result > std::ptr_fun (_Result(*__x)(_Arg))
Function Documentation
- template<typename _Arg1, typename _Arg2, typename _Result>
- pointer_to_binary_function<_Arg1, _Arg2, _Result> std::ptr_fun (_Result(*)(_Arg1, _Arg2) __x) [inline] One of the adaptors for function pointers.
- Definition at line 457 of file stl_function.h.
- template<typename _Arg, typename _Result> pointer_to_unary_function<_Arg,
- _Result> std::ptr_fun (_Result(*)(_Arg) __x) [inline] One of the adaptors for function pointers.
- Definition at line 431 of file stl_function.h.