50 lines
1.0 KiB
C++
50 lines
1.0 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) 2016-2023 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_RETURNS_H
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namespace ircd
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{
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inline namespace util
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{
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template<class T>
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struct returns;
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}
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}
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/// Simple convenience for cheesers to inherit from a POD type, similar to
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/// IRCD_STRONG_TYPEDEF but with additional specific features.
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template<class T>
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struct ircd::util::returns
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{
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T ret;
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operator const T &() const noexcept
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{
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return ret;
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}
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explicit operator T &() & noexcept
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{
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return ret;
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}
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returns(const std::function<T ()> &func)
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:ret{func()}
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{}
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returns(const T &ret) noexcept
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:ret{ret}
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{}
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returns() = default;
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};
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