mirror of https://github.com/axmolengine/axmol.git
129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_FUNCTIONAL_PIPEABLE_HPP
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#define RANGES_V3_FUNCTIONAL_PIPEABLE_HPP
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#include <concepts/concepts.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/functional/compose.hpp>
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#include <range/v3/functional/concepts.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-functional
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/// @{
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struct pipeable_base;
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template<typename T>
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RANGES_INLINE_VAR constexpr bool is_pipeable_v = META_IS_BASE_OF(pipeable_base, T);
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template<typename T>
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RANGES_INLINE_VAR constexpr bool is_pipeable_v<T &> = META_IS_BASE_OF(pipeable_base,
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T);
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template<typename T>
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RANGES_INLINE_VAR constexpr bool is_pipeable_v<T &&> = META_IS_BASE_OF(pipeable_base,
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T);
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template<typename T>
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using is_pipeable = meta::bool_<is_pipeable_v<T>>;
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struct make_pipeable_fn
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{
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template<typename Fun, typename PipeableBase = pipeable_base>
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constexpr auto operator()(Fun fun) const
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{
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struct local
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: Fun
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, PipeableBase
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{
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constexpr explicit local(Fun && f)
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: Fun(static_cast<Fun &&>(f))
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{}
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};
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return local{static_cast<Fun &&>(fun)};
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}
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};
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/// \ingroup group-functional
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/// \sa `make_pipeable_fn`
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RANGES_INLINE_VARIABLE(make_pipeable_fn, make_pipeable)
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struct pipeable_access
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{
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template<typename Pipeable>
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struct impl : Pipeable
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{
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using Pipeable::pipe;
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};
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};
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struct pipeable_base
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{
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private:
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friend pipeable_access;
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// Evaluate the pipe with an argument
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template(typename Arg, typename Pipe)(
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requires (!is_pipeable_v<Arg>) AND is_pipeable_v<Pipe> AND
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invocable<Pipe, Arg>) // clang-format off
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friend constexpr auto operator|(Arg &&arg, Pipe pipe) // clang-format off
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{
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return static_cast<Pipe &&>(pipe)(static_cast<Arg &&>(arg));
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}
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// Compose two pipes
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template(typename Pipe0, typename Pipe1)(
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requires is_pipeable_v<Pipe0> AND is_pipeable_v<Pipe1>) // clang-format off
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friend constexpr auto operator|(Pipe0 pipe0, Pipe1 pipe1) // clang-format on
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{
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return make_pipeable(compose(detail::move(pipe1), detail::move(pipe0)));
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}
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template<typename Arg, typename Pipe>
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friend auto operator|=(Arg & arg, Pipe pipe) //
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-> CPP_broken_friend_ret(Arg &)(
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requires (is_pipeable_v<Pipe>) &&
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(!is_pipeable_v<Arg>) && invocable<Pipe, Arg &>)
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{
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static_cast<Pipe &&>(pipe)(arg);
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return arg;
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}
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// Default Pipe behavior just passes the argument to the pipe's function call
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// operator
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// clang-format off
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template<typename Arg, typename Pipe>
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static constexpr auto CPP_auto_fun(pipe)(Arg && arg, Pipe p)
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(
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return static_cast<Pipe &&>(p)(static_cast<Arg &&>(arg))
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)
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// clang-format on
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};
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template<typename>
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using pipeable RANGES_DEPRECATED("Please use pipeable_base instead") = pipeable_base;
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/// \endcond
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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