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Allow hashing of enums.
Fixes errors like
/opt/poky/1.3.0-1/sysroots/i586-poky-linux/usr/include/boost/functional/hash/extensions.hpp:257:34: error: no matching function for call to 'hash_value(const myspace::idx&)'
Upstream-Status: Pending
Singed-off-by: Khem Raj <raj.khem@gmail.com>
Index: boost_1_51_0/boost/functional/hash/hash.hpp
===================================================================
--- boost_1_51_0.orig/boost/functional/hash/hash.hpp 2012-07-15 16:28:30.000000000 -0700
+++ boost_1_51_0/boost/functional/hash/hash.hpp 2012-09-26 14:00:57.738364002 -0700
@@ -15,6 +15,8 @@
#include <boost/functional/hash/detail/hash_float.hpp>
#include <string>
#include <boost/limits.hpp>
+#include <boost/type_traits/is_enum.hpp>
+#include <boost/utility/enable_if.hpp>
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
#include <boost/type_traits/is_pointer.hpp>
@@ -89,6 +91,9 @@
typename boost::hash_detail::long_numbers<T>::type hash_value(T);
template <typename T>
typename boost::hash_detail::ulong_numbers<T>::type hash_value(T);
+ template <typename T>
+ typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
+ hash_value(T);
#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
template <class T> std::size_t hash_value(T* const&);
@@ -178,7 +183,12 @@
{
return hash_detail::hash_value_unsigned(v);
}
-
+ template <typename T>
+ typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
+ hash_value(T v)
+ {
+ return static_cast<std::size_t>(v);
+ }
// Implementation by Alberto Barbati and Dave Harris.
#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
template <class T> std::size_t hash_value(T* const& v)
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