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74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
/*
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Copyright 2007-2008 David Nolden <david.nolden.kdevelop@art-master.de>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef KDEVPLATFORM_PUSHVALUE_H
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#define KDEVPLATFORM_PUSHVALUE_H
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/**
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* A simple helper-class that does the following:
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* Backup the given reference-value given through @param ptr,
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* replace it with the value given through @param push,
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* restore the backed up value back on destruction.
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* */
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template<class Value>
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class PushValue
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{
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public:
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PushValue( Value& ref, const Value& newValue = Value() )
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: m_ref(ref)
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{
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m_oldValue = m_ref;
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m_ref = newValue;
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}
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~PushValue()
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{
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m_ref = m_oldValue;
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}
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private:
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Value& m_ref;
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Value m_oldValue;
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};
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///Only difference to PushValue: The value is only replaced if the new value is positive
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template<class Value>
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class PushPositiveValue
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{
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public:
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PushPositiveValue( Value& ref, const Value& newValue = Value() )
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: m_ref(ref)
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{
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m_oldValue = m_ref;
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if( newValue ) {
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m_ref = newValue;
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}
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}
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~PushPositiveValue()
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{
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m_ref = m_oldValue;
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}
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private:
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Value& m_ref;
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Value m_oldValue;
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};
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#endif
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