http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58815
--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> --- Something like: Index: include/decimal/decimal =================================================================== --- include/decimal/decimal (revision 203915) +++ include/decimal/decimal (working copy) @@ -250,8 +250,10 @@ /// Conforming extension: Conversion from scalar decimal type. decimal32(__decfloat32 __z) : __val(__z) {} - // 3.2.2.5 Conversion to integral type. (DISABLED) - //operator long long() const { return (long long)__val; } +#if __cplusplus >= 201103L + // 3.2.2.5 Conversion to integral type. + explicit operator long long() const { return (long long)__val; } +#endif // 3.2.2.6 Increment and decrement operators. decimal32& operator++() @@ -333,8 +335,10 @@ /// Conforming extension: Conversion from scalar decimal type. decimal64(__decfloat64 __z) : __val(__z) {} - // 3.2.3.5 Conversion to integral type. (DISABLED) - //operator long long() const { return (long long)__val; } +#if __cplusplus >= 201103L + // 3.2.3.5 Conversion to integral type. + explicit operator long long() const { return (long long)__val; } +#endif // 3.2.3.6 Increment and decrement operators. decimal64& operator++() @@ -417,8 +421,10 @@ /// Conforming extension: Conversion from scalar decimal type. decimal128(__decfloat128 __z) : __val(__z) {} - // 3.2.4.5 Conversion to integral type. (DISABLED) - //operator long long() const { return (long long)__val; } +#if __cplusplus >= 201103L + // 3.2.4.5 Conversion to integral type. + explicit operator long long() const { return (long long)__val; } +#endif // 3.2.4.6 Increment and decrement operators. decimal128& operator++()