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/*=============================================================================
Copyright (c) 2011 Daniel James
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(BOOST_QUICKBOOK_INTRUSIVE_BASE_HPP)
#define BOOST_QUICKBOOK_INTRUSIVE_BASE_HPP
namespace quickbook
{
//
// instructive_base
//
template <typename T>
struct intrusive_base
{
intrusive_base() : ref_count_(0) {}
intrusive_base(intrusive_base const&) : ref_count_(0) {}
intrusive_base& operator=(intrusive_base const&) { return *this; }
~intrusive_base() { assert(!ref_count_); }
friend void intrusive_ptr_add_ref(T* ptr)
{ ++ptr->ref_count_; }
friend void intrusive_ptr_release(T* ptr)
{ if(--ptr->ref_count_ == 0) delete ptr; }
private:
unsigned ref_count_;
};
}
#endif
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