comparison: src/typeconversions.h
src/typeconversions.h
- changeset 250
- 2837b549e616
- parent 218
- 63125c36de73
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| 249:37d3c819cafa | 250:2837b549e616 |
|---|---|
| 83 using valuetype = std::underlying_type_t<std::remove_cvref_t<T>>; | 83 using valuetype = std::underlying_type_t<std::remove_cvref_t<T>>; |
| 84 using reftype = transfer_cvref_t<T&&, valuetype>; | 84 using reftype = transfer_cvref_t<T&&, valuetype>; |
| 85 return reinterpret_cast<reftype>(enu); | 85 return reinterpret_cast<reftype>(enu); |
| 86 } | 86 } |
| 87 | 87 |
| 88 //! \brief A version of static_cast that only works if casting from a wider | |
| 89 //! integer type to a narrower integer type. | |
| 90 template<typename T, typename R> | |
| 91 constexpr auto narrow(R x) | |
| 92 -> std::enable_if_t<sizeof(T) <= sizeof(R) and std::is_signed_v<T> == std::is_signed_v<R>, T> | |
| 93 { | |
| 94 return static_cast<T>(x); | |
| 95 } | |
| 96 | |
| 97 template<typename T, typename R> | |
| 98 constexpr auto widen(R x) | |
| 99 -> std::enable_if_t<sizeof(T) >= sizeof(R) and std::is_signed_v<T> == std::is_signed_v<R>, T> | |
| 100 { | |
| 101 return static_cast<T>(x); | |
| 102 } | |
| 103 | |
| 88 #endif // TYPECONVERSIONS_H | 104 #endif // TYPECONVERSIONS_H |
