/usr/include/boost/hana/fwd
Edit: /usr/include/boost/hana/fwd/zero.hpp (1095B)
/*!
@file
Forward declares `boost::hana::zero`.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_FWD_ZERO_HPP
#define BOOST_HANA_FWD_ZERO_HPP
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! Identity of `plus`.
//! @ingroup group-Monoid
//!
//! @tparam M
//! The tag (a `Monoid`) of the returned identity.
//!
//!
//! Example
//! -------
//! @include example/zero.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
template
constexpr auto zero = []() -> decltype(auto) {
return tag-dispatched;
};
#else
template
struct zero_impl : zero_impl> { };
template
struct zero_t {
constexpr decltype(auto) operator()() const;
};
template
constexpr zero_t zero{};
#endif
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FWD_ZERO_HPP