mirror of
https://github.com/matrix-construct/construct
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49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
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// 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_SCOPE_LIGHT_H
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namespace ircd::util
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{
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struct scope_light;
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};
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/// A simple boiler-plate for setting a bool to true when constructed and
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/// resetting it to its previous value when destructed. This takes a runtime
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/// reference to that bool. This is not intended to be a replacement for the
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/// reentrance_assertion utility or ctx::mutex et al.
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struct ircd::util::scope_light
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{
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bool *light {nullptr};
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bool theirs {false};
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scope_light(bool &light);
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scope_light(const scope_light &) = delete;
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scope_light(scope_light &&) noexcept = delete;
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~scope_light() noexcept;
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};
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inline
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ircd::util::scope_light::scope_light(bool &light)
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:light{&light}
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,theirs{light}
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{
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light = true;
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}
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inline
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ircd::util::scope_light::~scope_light()
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noexcept
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{
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assert(light);
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*light = theirs;
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}
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