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meta: FIX sfinae idiom in use_* aliases

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This commit is contained in:
Christos Houtouridis 2018-10-28 22:23:02 +02:00
parent d127713711
commit 7e25067468
2 changed files with 22 additions and 63 deletions
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4
include/utl/meta/if.h
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@ -53,10 +53,6 @@ namespace utl {
template<typename _Tp> // Partial specialization for false.
struct if_ <false, _Tp> { };
//! Alias template for if_
template<bool _C, typename _Tp = void>
using if_t = typename if_<_C, _Tp>::type;
//! @}
}
//! @}

81
include/utl/meta/sfinae.h
View File

@ -54,71 +54,34 @@ namespace utl {
using void_t = typename void_t_impl<_Ts...>::type;
//! @}
//! Alias template for if_
template<bool _C, typename _Tp = void>
using if_t = typename if_<_C, _Tp>::type;
//! If same type resolves to _Ret, else SFINAE
//! @{
template <typename _T1, typename _T2, typename _Ret =_T1>
struct use_if_same_ {
using type = if_t <
same_<_T1, _T2>::value,
_Ret
>;
};
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_same_t = typename use_if_same_<_T1, _T2, _Ret>::type;
//! @}
//! If not same type resolves to _Ret, else SFINAE
//! @{
template <typename _T1, typename _T2, typename _Ret =_T1>
struct use_if_not_same_ {
using type = if_t <
!same_<_T1, _T2>::value,
_Ret
>;
};
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_not_same_t = typename use_if_not_same_<_T1, _T2, _Ret>::type;
//! @}
//! If any type (_T1 or _T2) type resolves to _Ret, else to SFINAE
//! @{
template <typename _T1, typename _T2, typename _Ret =_T1>
struct use_if_any_ {
using type = if_t <
or_<_T1, _T2>::value,
_Ret
>;
};
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_any_t = typename use_if_any_<_T1, _T2, _Ret>::type;
//! @}
//! If both type (_T1 and _T2) type resolves to _Ret, else to SFINAE
//! @{
template <typename _T1, typename _T2, typename _Ret =_T1>
struct use_if_both_ {
using type = if_t <
and_<_T1, _T2>::value,
_Ret
>;
};
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_both_t = typename use_if_both_<_T1, _T2, _Ret>::type;
//! @}
//! Publicly recognized alias template for if_t
//! Publicly recognized alias template for if_
template<bool _C, typename _Tp = void>
using enable_if_t = typename if_<_C, _Tp>::type;
//! Uniform use_ style alias template for if_t
//!@{
//! Uniform alias template for if_
template<bool _C, typename _Tp = void>
using use_if_t = typename if_<_C, _Tp>::type;
//!@{
//! If same type resolves to _Ret, else SFINAE
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_same_t = typename if_<same_<_T1, _T2>::value, _Ret>::type;
//! If not same type resolves to _Ret, else SFINAE
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_not_same_t = typename if_<!same_<_T1, _T2>::value, _Ret>::type;
//! If any type (_T1 or _T2) type resolves to _Ret, else to SFINAE
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_any_t = typename if_<or_<_T1, _T2>::value, _Ret>::type;
//! If both type (_T1 and _T2) type resolves to _Ret, else to SFINAE
template <typename _T1, typename _T2, typename _Ret =_T1>
using use_if_both_t = typename if_<and_<_T1, _T2>::value, _Ret>::type;
}
//! @}