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new file, a small idea

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git-svn-id: svn://localhost/ardour2/branches/3.0@11257 d708f5d6-7413-0410-9779-e7cbd77b26cf
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Paul Davis 2012-01-18 01:34:53 +00:00
parent 508c5eb5bd
commit 567153e4fb
1 changed files with 38 additions and 0 deletions
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libs/pbd/pbd/unwind.h Normal file
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/*
Copyright (C) 2012 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __libpbd_unwinder_h__
#define __libpbd_unwinder_h__
namespace PBD {
template <typename T>
class Unwinder {
public:
Unwinder (T& var, T new_val) : _var (var), _old_val (var) { var = new_val; }
~Unwinder () { _var = _old_val; }
private:
T& _var;
T _old_val;
};
}
#endif /* __libpbd_unwinder_h__ */