boostorg/container_hash
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Use the underlying type for hashing enums

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This commit is contained in:
Peter Dimov
2022-07-03 20:29:28 +03:00
parent a3cac265b1
commit 80485fb963
1 changed files with 17 additions and 1 deletions
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18
include/boost/container_hash/hash.hpp
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@@ -26,7 +26,9 @@
#include <boost/type_traits/is_floating_point.hpp> #include <boost/type_traits/is_floating_point.hpp>
#include <boost/type_traits/is_signed.hpp> #include <boost/type_traits/is_signed.hpp>
#include <boost/type_traits/is_unsigned.hpp> #include <boost/type_traits/is_unsigned.hpp>
#include <boost/type_traits/make_signed.hpp>
#include <boost/type_traits/make_unsigned.hpp> #include <boost/type_traits/make_unsigned.hpp>
#include <boost/type_traits/conditional.hpp>
#include <boost/type_traits/enable_if.hpp> #include <boost/type_traits/enable_if.hpp>
#include <boost/type_traits/conjunction.hpp> #include <boost/type_traits/conjunction.hpp>
#include <boost/cstdint.hpp> #include <boost/cstdint.hpp>
@@ -38,6 +40,10 @@
#include <climits> #include <climits>
#include <cstring> #include <cstring>
#if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
# include <type_traits>
#endif
#if !defined(BOOST_NO_CXX11_SMART_PTR) #if !defined(BOOST_NO_CXX11_SMART_PTR)
# include <memory> # include <memory>
#endif #endif
@@ -163,7 +169,17 @@ namespace boost
typename boost::enable_if_<boost::is_enum<T>::value, std::size_t>::type typename boost::enable_if_<boost::is_enum<T>::value, std::size_t>::type
hash_value( T v ) hash_value( T v )
{ {
return static_cast<std::size_t>( v ); #if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
typedef typename std::underlying_type<T>::type U;
#else
typedef typename boost::conditional< boost::is_signed<T>::value, boost::make_signed<T>, boost::make_unsigned<T> >::type::type U;
#endif
return boost::hash_value( static_cast<U>( v ) );
} }
// floating point types // floating point types