leak_at_exit.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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/>.
 */
 
#ifndef KICAD_LEAK_AT_EXIT_H
#define KICAD_LEAK_AT_EXIT_H
 
#include <mutex>

 
#ifdef KICAD_SANITIZE_ADDRESS
#include <sanitizer/lsan_interface.h>
#define LSAN_IGNORE( ptr ) __lsan_ignore_object( ptr )
#else
#define LSAN_IGNORE( ptr ) (void)( ptr )
#endif
 

template <typename T>
class LEAK_AT_EXIT
{
public:
    LEAK_AT_EXIT() : m_instance( nullptr ) {}
 
    // Non-copyable, non-movable
    LEAK_AT_EXIT( const LEAK_AT_EXIT& ) = delete;
    LEAK_AT_EXIT& operator=( const LEAK_AT_EXIT& ) = delete;
    LEAK_AT_EXIT( LEAK_AT_EXIT&& ) = delete;
    LEAK_AT_EXIT& operator=( LEAK_AT_EXIT&& ) = delete;

    T& Get()
    {
        std::call_once( m_initFlag, [this]()
        {
            m_instance = new T();
            LSAN_IGNORE( m_instance );
        } );
 
        return *m_instance;
    }
 
    T& operator*() { return Get(); }
    T* operator->() { return &Get(); }
 
    // Allow implicit conversion to reference for compatibility
    operator T&() { return Get(); }
 
private:
    T*             m_instance;
    std::once_flag m_initFlag;
};
 
 
#endif // KICAD_LEAK_AT_EXIT_H