94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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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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@tags{Core}
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*/
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template <typename ValueType>
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class ScopedValueSetter
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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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JUCE_DECLARE_NON_COPYABLE (ScopedValueSetter)
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};
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} // namespace juce
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