...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
The header
<boost/functional/identity.hpp> provides the function object
boost::identity
whose operator()
returns its
argument. It is an implementation of C++20's std::identity
that supports C++03 and above.
It is commonly used as the default projection in constrained algorithms.
template<class Range, class Projection = boost::identity>
void print(Range&& range, Projection projection = {});
namespace boost {
struct identity {
using is_transparent = unspecified;
template<class T>
T&& operator()(T&& value) const noexcept;
};
} // boost
template<class T>
T&& operator()(T&& value) const noexcept;
std::forward<T>(value)
Copyright 2021 Glen Joseph Fernandes.
Distributed under the Boost Software License, Version 1.0.