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BAN: add either_or and either_or_t 

This allows you to select type depending on constexpr evaluatable
boolean
This commit is contained in:
Bananymous 2023-07-12 13:34:31 +03:00
parent 9eab6710ce
commit 5df48804e1
1 changed files with 4 additions and 0 deletions
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4
BAN/include/BAN/Traits.h
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@ -30,6 +30,10 @@ namespace BAN
template<typename T> struct maybe_const<true, T> { using type = const T; };
template<bool B, typename T> using maybe_const_t = typename maybe_const<B, T>::type;
template<bool B, typename T1, typename T2> struct either_or { using type = T2; };
template<typename T1, typename T2> struct either_or<true, T1, T2> { using type = T1; };
template<bool B, typename T1, typename T2> using either_or_t = typename either_or<B, T1, T2>::type;
struct true_type { static constexpr bool value = true; };
struct false_type { static constexpr bool value = false; };