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ircd::util: Add scope_light tool.

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This commit is contained in:
Jason Volk 2019-01-02 10:43:36 -08:00
parent 84265c3a13
commit 09424ab344
2 changed files with 49 additions and 0 deletions
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48
include/ircd/util/scope_light.h Normal file
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@ -0,0 +1,48 @@
// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_UTIL_SCOPE_LIGHT_H
namespace ircd::util
{
struct scope_light;
};
/// A simple boiler-plate for setting a bool to true when constructed and
/// resetting it to its previous value when destructed. This takes a runtime
/// reference to that bool. This is not intended to be a replacement for the
/// reentrance_assertion utility or ctx::mutex et al.
struct ircd::util::scope_light
{
bool *light {nullptr};
bool theirs {false};
scope_light(bool &light);
scope_light(const scope_light &) = delete;
scope_light(scope_light &&) noexcept = delete;
~scope_light() noexcept;
};
inline
ircd::util::scope_light::scope_light(bool &light)
:light{&light}
,theirs{light}
{
light = true;
}
inline
ircd::util::scope_light::~scope_light()
noexcept
{
assert(light);
*light = theirs;
}

1
include/ircd/util/util.h
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@ -45,6 +45,7 @@ namespace ircd
#include "bswap.h"
#include "tuple.h"
#include "timer.h"
#include "scope_light.h"
#include "life_guard.h"
#include "pubsetbuf.h"
#include "string.h"