62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/// \file autoflag.h
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/// \brief Defines a template for setting a flag within a given variable
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/// scope, and resetting it when exiting that scope.
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/***********************************************************************
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Copyright © 2007 by Educational Technology Resources, Inc.
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Others may also hold copyrights on code in this file. See the
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CREDITS.txt file in the top directory of the distribution for details.
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This file is part of MySQL++.
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MySQL++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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MySQL++ is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with MySQL++; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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***********************************************************************/
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#if !defined(MYSQLPP_AUTOFLAG_H)
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#define MYSQLPP_AUTOFLAG_H
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namespace mysqlpp {
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/// \brief A template for setting a flag on a variable as long as the
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/// object that set it is in scope. Flag resets when object goes
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/// out of scope. Works on anything that looks like bool.
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template <class T = bool>
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class AutoFlag
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{
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public:
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/// \brief Constructor: sets ref to true.
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AutoFlag(T& ref) :
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referent_(ref)
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{
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referent_ = true;
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}
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/// \brief Destructor: sets referent passed to ctor to false.
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~AutoFlag()
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{
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referent_ = false;
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}
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private:
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T& referent_;
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};
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} // end namespace mysqlpp
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#endif // !defined(MYSQLPP_AUTOFLAG_H)
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