Fixed testing of 128bit integer types and added staic assert that cheks for std::numeric_limits specializations, if they are required for conversion (refs #8790)

[SVN r85072]
2013-07-18 08:45:09 +00:00
parent 91aa2ce64d
commit 13d98f02d0
2 changed files with 30 additions and 2 deletions
@@ -879,6 +879,15 @@ namespace boost {
        {
 #ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
            BOOST_STATIC_ASSERT(!std::numeric_limits<T>::is_signed);
+
+            // GCC when used with flag -std=c++0x may not have std::numeric_limits
+            // specializations for __int128 and unsigned __int128 types.
+            // Try compilation with -std=gnu++0x or -std=gnu++11.
+            //
+            // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40856
+            BOOST_STATIC_ASSERT_MSG(std::numeric_limits<T>::is_specialized,
+                "std::numeric_limits are not specialized for integral type passed to boost::lexical_cast"
+            );
 #endif
            CharT const czero = lcast_char_constants<CharT>::zero;
            --end;