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/*
SPDX-FileCopyrightText: 2007-2008 David Nolden <david.nolden.kdevelop@art-master.de>
SPDX-License-Identifier: LGPL-2.0-only
*/
#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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