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Use std::hash<std::error_code> in hash_value

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This commit is contained in:
Peter Dimov
2021-06-14 01:51:33 +03:00
parent e625bd0eea
commit e9cdb10409
1 changed files with 16 additions and 0 deletions
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16
include/boost/system/detail/error_code.hpp
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@ -44,8 +44,14 @@ namespace system
// and error_code containing a pointer to an object of a type derived
// from error_category.
std::size_t hash_value( error_code const & ec );
class error_code
{
private:
friend std::size_t hash_value( error_code const & ec );
private:
struct data
@ -352,6 +358,16 @@ public:
inline std::size_t hash_value( error_code const & ec )
{
#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
if( ec.flags_ == 1 )
{
std::error_code const& e2 = *reinterpret_cast<std::error_code const*>( ec.d2_ );
return std::hash<std::error_code>()( e2 );
}
#endif
error_category const & cat = ec.category();
boost::ulong_long_type id_ = cat.id_;