45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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/*!
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@file
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Forward declares `boost::hana::max`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_FWD_MAX_HPP
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#define BOOST_HANA_FWD_MAX_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/when.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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//! Returns the greatest of its arguments according to the `less` ordering.
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//! @ingroup group-Orderable
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//!
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//!
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//! @todo Can't specify the signature here either. See `min` for details.
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//!
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//! Example
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//! -------
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//! @include example/max.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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constexpr auto max = [](auto&& x, auto&& y) -> decltype(auto) {
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return tag-dispatched;
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};
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#else
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template <typename T, typename U, typename = void>
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struct max_impl : max_impl<T, U, when<true>> { };
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struct max_t {
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template <typename X, typename Y>
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constexpr decltype(auto) operator()(X&& x, Y&& y) const;
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};
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constexpr max_t max{};
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#endif
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_MAX_HPP
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