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d580e7c694
* Use nullptr (C++11) instead of NULL. * Put each file into its own namespace declaration. * Remove "using namespace" directives and add scope qualifiers. * Control when beast's implementation of std::equal (C++14) is used. * Tidy up some const declarations. Conflicts: src/ripple_app/shamap/SHAMapSync.cpp src/ripple_app/tx/TransactionEngine.cpp
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Portions of this file are from JUCE.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Please visit http://www.juce.com
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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 appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_SCOPEDVALUESETTER_H_INCLUDED
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#define BEAST_SCOPEDVALUESETTER_H_INCLUDED
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namespace beast
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{
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//==============================================================================
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/**
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Helper class providing an RAII-based mechanism for temporarily setting and
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then re-setting a value.
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E.g. @code
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int x = 1;
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{
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ScopedValueSetter setter (x, 2);
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// x is now 2
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}
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// x is now 1 again
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{
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ScopedValueSetter setter (x, 3, 4);
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// x is now 3
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}
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// x is now 4
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@endcode
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*/
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template <typename ValueType>
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class ScopedValueSetter : public Uncopyable
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{
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public:
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/** Creates a ScopedValueSetter that will immediately change the specified value to the
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given new value, and will then reset it to its original value when this object is deleted.
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*/
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ScopedValueSetter (ValueType& valueToSet,
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ValueType newValue)
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: value (valueToSet),
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originalValue (valueToSet)
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{
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valueToSet = newValue;
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}
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/** Creates a ScopedValueSetter that will immediately change the specified value to the
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given new value, and will then reset it to be valueWhenDeleted when this object is deleted.
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*/
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ScopedValueSetter (ValueType& valueToSet,
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ValueType newValue,
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ValueType valueWhenDeleted)
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: value (valueToSet),
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originalValue (valueWhenDeleted)
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{
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valueToSet = newValue;
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}
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~ScopedValueSetter()
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{
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value = originalValue;
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}
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private:
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//==============================================================================
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ValueType& value;
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const ValueType originalValue;
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};
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} // namespace beast
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#endif // BEAST_SCOPEDVALUESETTER_H_INCLUDED
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