gmemory.h

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//
// Copyright (C) 2017 Graeme Walker
// 
// 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 3 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, see <http://www.gnu.org/licenses/>.
// ===
///
/// \file gmemory.h
///

#ifndef G_MEMORY_H
#define G_MEMORY_H

#include "gdef.h"
#include <memory>

/// A portable fix for the problem of resetting an auto_ptr<>. Some compilers 
/// do not have a reset() method, and some have non-const assignment operators.
/// 
/// Usage:
/// \code
/// {
///   std::auto_ptr<Foo> ptr ;
///   for( int i = 0 ; i < 10 ; i++ )
///   {
///      ptr <<= new Foo ;
///      if( ptr->fn() )
///         eatFoo( ptr->release() ) ;
///   }
/// }
/// \endcode
/// 
template <typename T>
void operator<<=( std::auto_ptr<T> & ap , T * p )
{
    std::auto_ptr<T> temp( p ) ;
    ap = temp ;
}

/// 
template <typename T>
void operator<<=( std::auto_ptr<T> & ap , int /* null_pointer */ )
{
    T * p = 0 ;
    ap <<= p ;
}

#endif