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Add helper functions get_generic_std_category, get_system_std_category

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This commit is contained in:
Peter Dimov
2021-09-21 15:01:44 +03:00
parent cc6a61b6c5
commit 9b11d864be
1 changed files with 36 additions and 16 deletions
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52
include/boost/system/detail/error_category_impl.hpp
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@@ -20,7 +20,6 @@
namespace boost namespace boost
{ {
namespace system namespace system
{ {
@@ -91,7 +90,6 @@ inline char const * error_category::message( int ev, char * buffer, std::size_t
} }
} // namespace system } // namespace system
} // namespace boost } // namespace boost
// interoperability with std::error_code, std::error_condition // interoperability with std::error_code, std::error_condition
@@ -100,44 +98,63 @@ inline char const * error_category::message( int ev, char * buffer, std::size_t
#include <boost/system/detail/std_category.hpp> #include <boost/system/detail/std_category.hpp>
inline boost::system::error_category::operator std::error_category const & () const namespace boost
{
namespace system
{
namespace detail
{
inline std::error_category const & get_generic_std_category()
{ {
if( id_ == boost::system::detail::generic_category_id )
{
#if defined(BOOST_GCC) && BOOST_GCC < 50000 #if defined(BOOST_GCC) && BOOST_GCC < 50000
static const boost::system::detail::std_category generic_instance( this, 0x1F4D3 ); static const boost::system::detail::std_category generic_instance( this, 0x1F4D3 );
return generic_instance; return generic_instance;
#else #else
return std::generic_category(); return std::generic_category();
#endif #endif
} }
if( id_ == boost::system::detail::system_category_id ) inline std::error_category const & get_system_std_category()
{ {
#if 0 #if 0
static const boost::system::detail::std_category system_instance( this, 0x1F4D7 ); static const boost::system::detail::std_category system_instance( this, 0x1F4D7 );
return system_instance; return system_instance;
#else #else
return std::system_category(); return std::system_category();
#endif #endif
}
} // namespace detail
inline error_category::operator std::error_category const & () const
{
if( id_ == detail::generic_category_id )
{
return detail::get_generic_std_category();
} }
boost::system::detail::std_category* p = ps_.load( std::memory_order_acquire ); if( id_ == detail::system_category_id )
{
return detail::get_system_std_category();
}
detail::std_category* p = ps_.load( std::memory_order_acquire );
if( p != 0 ) if( p != 0 )
{ {
return *p; return *p;
} }
boost::system::detail::std_category* q = new detail::std_category( this, 0 ); detail::std_category* q = new detail::std_category( this, 0 );
if( ps_.compare_exchange_strong( p, q, std::memory_order_release, std::memory_order_acquire ) ) if( ps_.compare_exchange_strong( p, q, std::memory_order_release, std::memory_order_acquire ) )
{ {
@@ -150,6 +167,9 @@ inline boost::system::error_category::operator std::error_category const & () co
} }
} }
} // namespace system
} // namespace boost
#endif // #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR) #endif // #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
#endif // #ifndef BOOST_SYSTEM_DETAIL_ERROR_CATEGORY_IMPL_HPP_INCLUDED #endif // #ifndef BOOST_SYSTEM_DETAIL_ERROR_CATEGORY_IMPL_HPP_INCLUDED