Supplements to <functional>.

#include <cxxomfort/library/functional.hpp>
namespace functional2 = cxxomfort::library::functional;

This component offers a number of alternatives and supplements to features found in <functional> such as function objects to complete various tasks, a function-like reference wrapper, and function objects that complement the plus family.

#noop - an object that does nothing with its arguments.
ptr_fun() for nullary functions.
Supplements to named operators:
- preincrement , predecrement .
- Operator+assignment operators plus_it , minus_it , multiplies_it , divides_it , modulus_it .
- Function object equivalent_to ("not less or greater").
is_std_function .
constant_function .
- The assist functions true_fn() , false_fn() and constant_fn() that create specific constants.
#functiontype - meta information on function signatures.
#function_caller - zero-cost function object calling a named C function.
#function_ref - non-owning reference to a function-like callable.
overload() metafunction.

Operators

Given a Standard C++ operator wrapper like std::plus, which wraps operator+(), cxxomfort also provides an analogue plus_it which wraps operator+=(). That is, they operate in the following way:

plus<float> p;
plus_it<float,float> pa; // plus_assign
float r = p(3, M_PI); // same as r = 3 + M_PI;
pa(r, -4.12); // same as r+= -4.12;

The cxxomfort supplemental functor equivalent_to tests for potential "equivalence" between two objects - that is, none is less than the other.

function_caller

Class is_std_function< T >