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Fix hash_value

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This commit is contained in:
Peter Dimov
2018-09-17 18:18:37 +03:00
parent 11b07164c1
commit 11a908a3fe
2 changed files with 47 additions and 5 deletions
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33
include/boost/system/error_code.hpp
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@ -162,8 +162,14 @@ template<> struct is_error_condition_enum<errc::errc_t>
#pragma warning( disable: 4355 )
#endif
std::size_t hash_value( error_code const & ec );
class BOOST_SYMBOL_VISIBLE error_category
{
private:
friend std::size_t hash_value( error_code const & ec );
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS)
public:
@ -692,10 +698,31 @@ template <class charT, class traits>
return os;
}
inline std::size_t hash_value( const error_code & ec )
inline std::size_t hash_value( error_code const & ec )
{
// TODO use category id_, FNV combiner
return static_cast<std::size_t>( ec.value() ) + reinterpret_cast<std::size_t>( &ec.category() );
error_category const & cat = ec.category();
boost::ulong_long_type id = cat.id_;
if( id == 0 )
{
id = reinterpret_cast<boost::ulong_long_type>( &cat );
}
boost::ulong_long_type hv = 0xCBF29CE484222325ull;
boost::ulong_long_type const prime = 0x00000100000001B3ull;
// id
hv ^= id;
hv *= prime;
// value
hv ^= static_cast<unsigned>( ec.value() );
hv *= prime;
return static_cast<std::size_t>( hv );
}
// make_* functions for errc::errc_t

19
test/single_instance_test.cpp
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@ -25,8 +25,23 @@ error_code get_generic_code();
int main()
{
BOOST_TEST_EQ( lib1::get_system_code(), lib2::get_system_code() );
BOOST_TEST_EQ( lib1::get_generic_code(), lib2::get_generic_code() );
{
error_code e1 = lib1::get_system_code();
error_code e2 = lib2::get_system_code();
BOOST_TEST_EQ( e1, e2 );
BOOST_TEST_EQ( hash_value( e1 ), hash_value( e2 ) );
}
{
error_code e1 = lib1::get_generic_code();
error_code e2 = lib2::get_generic_code();
BOOST_TEST_EQ( e1, e2 );
BOOST_TEST_EQ( hash_value( e1 ), hash_value( e2 ) );
}
return boost::report_errors();
}