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/*! @file Forward declares `boost::hana::less_equal`. @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_LESS_EQUAL_HPP #define BOOST_HANA_FWD_LESS_EQUAL_HPP #include <boost/hana/config.hpp> #include <boost/hana/core/when.hpp> #include <boost/hana/detail/nested_than_fwd.hpp> BOOST_HANA_NAMESPACE_BEGIN //! Returns a `Logical` representing whether `x` is less than or //! equal to `y`. //! @ingroup group-Orderable //! //! //! Signature //! --------- //! Given a Logical `Bool` and two Orderables `A` and `B` with a common //! embedding, the signature is //! @f$ \mathrm{less\_equal} : A \times B \to Bool @f$. //! //! @param x, y //! Two objects to compare. //! //! //! Example //! ------- //! @include example/less_equal.cpp #ifdef BOOST_HANA_DOXYGEN_INVOKED constexpr auto less_equal = [](auto&& x, auto&& y) { return tag-dispatched; }; #else template <typename T, typename U, typename = void> struct less_equal_impl : less_equal_impl<T, U, when<true>> { }; struct less_equal_t : detail::nested_than<less_equal_t> { template <typename X, typename Y> constexpr auto operator()(X&& x, Y&& y) const; }; constexpr less_equal_t less_equal{}; #endif BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_FWD_LESS_EQUAL_HPP
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