You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
92 lines
2.3 KiB
92 lines
2.3 KiB
#ifndef BOOST_STATECHART_DETAIL_COUNTED_BASE_HPP_INCLUDED |
|
#define BOOST_STATECHART_DETAIL_COUNTED_BASE_HPP_INCLUDED |
|
////////////////////////////////////////////////////////////////////////////// |
|
// Copyright 2002-2006 Andreas Huber Doenni |
|
// Distributed under the Boost Software License, Version 1.0. (See accompany- |
|
// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
|
////////////////////////////////////////////////////////////////////////////// |
|
|
|
|
|
|
|
#include <boost/detail/atomic_count.hpp> |
|
#include <boost/config.hpp> // BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP |
|
|
|
|
|
|
|
namespace boost |
|
{ |
|
namespace statechart |
|
{ |
|
namespace detail |
|
{ |
|
|
|
|
|
|
|
template< bool NeedsLocking > |
|
struct count_base |
|
{ |
|
count_base() : count_( 0 ) {} |
|
mutable boost::detail::atomic_count count_; |
|
}; |
|
|
|
template<> |
|
struct count_base< false > |
|
{ |
|
count_base() : count_( 0 ) {} |
|
mutable long count_; |
|
}; |
|
|
|
////////////////////////////////////////////////////////////////////////////// |
|
template< bool NeedsLocking = true > |
|
class counted_base : private count_base< NeedsLocking > |
|
{ |
|
typedef count_base< NeedsLocking > base_type; |
|
public: |
|
////////////////////////////////////////////////////////////////////////// |
|
bool ref_counted() const |
|
{ |
|
return base_type::count_ != 0; |
|
} |
|
|
|
long ref_count() const |
|
{ |
|
return base_type::count_; |
|
} |
|
|
|
protected: |
|
////////////////////////////////////////////////////////////////////////// |
|
counted_base() {} |
|
~counted_base() {} |
|
|
|
// do nothing copy implementation is intentional (the number of |
|
// referencing pointers of the source and the destination is not changed |
|
// through the copy operation) |
|
counted_base( const counted_base & ) : base_type() {} |
|
counted_base & operator=( const counted_base & ) { return *this; } |
|
|
|
public: |
|
////////////////////////////////////////////////////////////////////////// |
|
// The following declarations should be private. |
|
// They are only public because many compilers lack template friends. |
|
////////////////////////////////////////////////////////////////////////// |
|
void add_ref() const |
|
{ |
|
++base_type::count_; |
|
} |
|
|
|
bool release() const |
|
{ |
|
BOOST_ASSERT( base_type::count_ > 0 ); |
|
return --base_type::count_ == 0; |
|
} |
|
}; |
|
|
|
|
|
|
|
} // namespace detail |
|
} // namespace statechart |
|
} // namespace boost |
|
|
|
|
|
|
|
#endif
|
|
|