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types/traits: add try_underlying

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This commit is contained in:
Danny Robson 2020-09-11 13:36:17 +10:00
parent 34aed6c74d
commit c23d2e38f3
1 changed files with 14 additions and 0 deletions
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14
types/traits.hpp
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@ -120,6 +120,20 @@ template <typename ValueT>
using try_signed_t = typename try_signed<ValueT>::type;
///////////////////////////////////////////////////////////////////////////////
namespace cruft {
template <typename ValueT, typename = void>
struct try_underlying { using type = ValueT; };
template <typename ValueT>
struct try_underlying<
ValueT,
std::void_t<std::underlying_type_t<ValueT>>
> { using type = std::underlying_type<ValueT>; };
}
///////////////////////////////////////////////////////////////////////////////
/// checks if a type can be converted in all cases without modification
template <typename T, typename U> struct is_lossless_cast : std::enable_if<