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Remove unused identity utilities

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This commit is contained in:
Denis Blank 2018-03-14 07:26:11 +01:00
parent 83f736a93f
commit 65e41a2cbd
1 changed files with 0 additions and 19 deletions
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19
include/continuable/detail/traits.hpp
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@ -41,10 +41,6 @@
namespace cti { namespace cti {
namespace detail { namespace detail {
namespace traits { namespace traits {
/// Evaluates to the element at position I.
template <std::size_t I, typename... Args>
using at_t = decltype(std::get<I>(std::declval<std::tuple<Args...>>()));
namespace detail { namespace detail {
template <typename T, typename... Args> template <typename T, typename... Args>
struct index_of_impl; struct index_of_impl;
@ -64,31 +60,16 @@ using index_of_t = detail::index_of_impl<T, Args...>;
/// A tagging type for wrapping other types /// A tagging type for wrapping other types
template <typename... T> template <typename... T>
struct identity {}; struct identity {};
template <typename T>
struct identity<T> : std::common_type<T> {};
template <typename> template <typename>
struct is_identity : std::false_type {}; struct is_identity : std::false_type {};
template <typename... Args> template <typename... Args>
struct is_identity<identity<Args...>> : std::true_type {}; struct is_identity<identity<Args...>> : std::true_type {};
template <typename T>
constexpr identity<std::decay_t<T>> identity_of(T const& /*type*/) noexcept {
return {};
}
template <typename... Args>
constexpr identity<Args...> identity_of(identity<Args...> /*type*/) noexcept {
return {};
}
template <typename T> template <typename T>
using identify = std::conditional_t<is_identity<std::decay_t<T>>::value, T, using identify = std::conditional_t<is_identity<std::decay_t<T>>::value, T,
identity<std::decay_t<T>>>; identity<std::decay_t<T>>>;
template <std::size_t I, typename... T>
constexpr auto get(identity<T...>) noexcept {
return identify<at_t<I, T...>>{};
}
#if defined(CONTINUABLE_HAS_CXX17_VOID_T) #if defined(CONTINUABLE_HAS_CXX17_VOID_T)
using std::void_t; using std::void_t;
#else #else