111 lines
2.4 KiB
C++
111 lines
2.4 KiB
C++
//
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// Copyright (C) 2001-2007 Graeme Walker <graeme_walker@users.sourceforge.net>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// ===
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///
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/// \file gcounter.h
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///
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#ifndef G_OBJECT_COUNTER_H
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#define G_OBJECT_COUNTER_H
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#include "gdef.h"
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#include "gdebug.h"
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/// \namespace G
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namespace G
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{
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class CounterImp ;
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}
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/// \class G::CounterImp
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/// A private implementation class used
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/// by the G::Counter<> class template.
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///
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class G::CounterImp
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{
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public:
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static void check( const char * class_name , unsigned long n ) ;
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///< Checks the instance counter.
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} ;
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/// \namespace G
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namespace G
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{
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/// \class G::Counter
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/// An instance counter to help with leak testing.
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///
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/// Typically used as a private base class. (Strictly
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/// this uses the curiously recurring template pattern, but
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/// it does not do any static_cast<D> downcasting.)
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///
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/// Note that the second template parameter (the class name)
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/// needs a declaration like "extern char FooClassName[]",
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/// not a string literal.
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///
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template <typename D, const char * C>
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class Counter : private CounterImp
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{
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public:
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Counter() ;
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///< Constructor.
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~Counter() ;
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///< Destructor.
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Counter( const Counter<D,C> & ) ;
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///< Copy constructor.
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void operator=( const Counter<D,C> & ) ;
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///< Assignment operator.
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private:
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static unsigned long m_n ;
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} ;
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template <typename D, const char * C>
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unsigned long Counter<D,C>::m_n = 0UL ;
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template <typename D, const char * C>
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Counter<D,C>::Counter()
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{
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m_n++ ;
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check( C , m_n ) ;
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}
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template <typename D, const char * C>
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Counter<D,C>::~Counter()
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{
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m_n-- ;
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check( C , m_n ) ;
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}
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template <typename D, const char * C>
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Counter<D,C>::Counter( const Counter<D,C> & )
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{
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m_n++ ;
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check( C , m_n ) ;
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}
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template <typename D, const char * C>
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void Counter<D,C>::operator=( const Counter<D,C> & )
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{
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}
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}
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#endif
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