/usr/include/kdevplatform/util/pushvalue.h is in kdevelop-dev 4:5.2.1-1ubuntu4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | /*
Copyright 2007-2008 David Nolden <david.nolden.kdevelop@art-master.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KDEVPLATFORM_PUSHVALUE_H
#define KDEVPLATFORM_PUSHVALUE_H
#include <QScopedValueRollback>
/**
* A simple helper-class that does the following:
* Backup the given reference-value given through @p ptr,
* replace it with the value given through @p push,
* restore the backed up value back on destruction.
*
* NOTE: This is _not_ a direct alias of QScopedValueRollback,
* the behavior of the constructor is different:
* PushValue will *always* push, PushPositiveValue will only
* push if the value evaluates to true. QScopedValueRollback
* will *always* push with the ctor that takes a new value,
* and *never* with the ctor that just takes a ref.
**/
template<class Value>
class PushValue : public QScopedValueRollback<Value>
{
public:
explicit PushValue(Value& ref, const Value& newValue = Value())
: QScopedValueRollback<Value>(ref, newValue)
{
}
};
///Only difference to PushValue: The value is only replaced if the new value is positive
template<class Value>
class PushPositiveValue : public QScopedValueRollback<Value>
{
public:
explicit PushPositiveValue(Value& ref, const Value& newValue = Value())
: QScopedValueRollback<Value>(ref)
{
if (newValue) {
ref = newValue;
}
}
};
#endif
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