pointer_to_binary_function Class
Converts a binary function pointer into an adaptable binary function. Deprecated in C++11, removed in C++17.
Syntax
template <class Arg1, class Arg2, class Result>
class pointer_to_binary_function
: public binary_function <Arg1, Arg2, Result>
{
explicit pointer_to_binary_function(
Result(*pfunc)(Arg1, Arg2));
Result operator()(Arg1 left, 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 class template 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 C++ Standard 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.
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