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types: add is_lossless_cast trait query

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This commit is contained in:
Danny Robson 2014-07-15 19:51:42 +10:00
parent cb1824a387
commit 5820b75764
1 changed files with 11 additions and 0 deletions
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11
types/traits.hpp
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@ -52,4 +52,15 @@ template <typename T> struct always_unsigned {
template <> struct always_unsigned<double> { typedef double type; }; template <> struct always_unsigned<double> { typedef double type; };
template <> struct always_unsigned<float > { typedef float type; }; template <> struct always_unsigned<float > { typedef float type; };
//-----------------------------------------------------------------------------
template <typename T, typename U> struct is_lossless_cast : std::enable_if<
std::is_integral<T>::value &&
std::is_integral<U>::value &&
std::is_signed<T>::value == std::is_signed<U>::value &&
sizeof (T) <= sizeof (U),
std::true_type
>::value { };
#endif #endif