mirror of
https://github.com/matrix-construct/construct
synced 2024-11-14 22:11:06 +01:00
115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_CLOSURE_H
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namespace ircd {
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inline namespace util
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{
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template<template<class, class...>
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class F,
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class R,
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class... A>
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struct closure;
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template<template<class, class...>
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class F,
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class... A>
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struct closure<F, bool, A...>;
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/// Template for creating callback-based iterations allowing closures of
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/// either `void (...)` or `bool (...)` to be passed to the same overload.
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///
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/// This reduces/deduplicates interfaces which offer an overload for each
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/// and thus two library symbols, usually just calling each other...
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///
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template<template<class, class...>
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class F,
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class... A>
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using closure_bool = closure<F, bool, A...>;
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}}
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template<template<class, class...>
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class F,
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class R,
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class... A>
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struct ircd::util::closure
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:F<R (A...)>
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{
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using proto_type = R (A...);
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using func_type = F<proto_type>;
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using func_type::func_type;
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using func_type::operator=;
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};
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template<template<class, class...>
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class F,
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class... A>
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struct ircd::util::closure<F, bool, A...>
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:F<bool (A...)>
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{
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using proto_bool_type = bool (A...);
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using proto_void_type = void (A...);
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using func_bool_type = F<proto_bool_type>;
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using func_void_type = F<proto_void_type>;
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template<class lambda>
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closure(lambda &&o,
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typename std::enable_if<!std::is_constructible<func_bool_type, lambda>::value, int>::type = 0)
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noexcept(std::is_nothrow_invocable<lambda, void, A...>());
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template<class lambda>
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closure(lambda &&o,
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typename std::enable_if<std::is_constructible<func_bool_type, lambda>::value, int>::type = 0)
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noexcept(std::is_nothrow_invocable<lambda, bool, A...>());
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};
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template<template<class, class...>
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class F,
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class... A>
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template<class lambda>
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[[gnu::always_inline]]
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inline
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ircd::util::closure<F, bool, A...>::closure(lambda &&o,
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typename std::enable_if<!std::is_constructible<func_bool_type, lambda>::value, int>::type)
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noexcept(std::is_nothrow_invocable<lambda, void, A...>())
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:F<bool (A...)>
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{
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[o(std::move(o))](A&&... a)
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noexcept(std::is_nothrow_invocable<lambda, void, A...>())
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{
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static_assert
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(
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std::is_same<void, decltype(o(std::forward<A>(a)...))>()
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);
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o(std::forward<A>(a)...);
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return true;
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}
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}
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{}
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template<template<class, class...>
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class F,
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class... A>
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template<class lambda>
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[[gnu::always_inline]]
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inline
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ircd::util::closure<F, bool, A...>::closure(lambda &&o,
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typename std::enable_if<std::is_constructible<func_bool_type, lambda>::value, int>::type)
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noexcept(std::is_nothrow_invocable<lambda, bool, A...>())
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:F<bool (A...)>
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{
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std::forward<lambda>(o)
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}
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{}
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