build: remove entt library

include/entt/core/tuple.hpp

@@ -1,90 +0,0 @@
-#ifndef ENTT_CORE_TUPLE_HPP
-#define ENTT_CORE_TUPLE_HPP
-
-#include "../stl/tuple.hpp"
-#include "../stl/type_traits.hpp"
-#include "../stl/utility.hpp"
-
-namespace entt {
-
-/**
- * @brief Provides the member constant `value` equal to true if a given type is
- * a tuple, false otherwise.
- * @tparam Type The type to test.
- */
-template<typename Type>
-struct is_tuple: stl::false_type {};
-
-/**
- * @copybrief is_tuple
- * @tparam Args Tuple template arguments.
- */
-template<typename... Args>
-struct is_tuple<stl::tuple<Args...>>: stl::true_type {};
-
-/**
- * @brief Helper variable template.
- * @tparam Type The type to test.
- */
-template<typename Type>
-inline constexpr bool is_tuple_v = is_tuple<Type>::value;
-
-/**
- * @brief Utility function to unwrap tuples of a single element.
- * @tparam Type Tuple type of any sizes.
- * @param value A tuple object of the given type.
- * @return The tuple itself if it contains more than one element, the first
- * element otherwise.
- */
-template<typename Type>
-constexpr decltype(auto) unwrap_tuple(Type &&value) noexcept {
-    if constexpr(stl::tuple_size_v<stl::remove_reference_t<Type>> == 1u) {
-        return stl::get<0>(stl::forward<Type>(value));
-    } else {
-        return stl::forward<Type>(value);
-    }
-}
-
-/**
- * @brief Utility class to forward-and-apply tuple objects.
- * @tparam Func Type of underlying invocable object.
- */
-template<typename Func>
-struct forward_apply: private Func {
-    /**
-     * @brief Constructs a forward-and-apply object.
-     * @tparam Args Types of arguments to use to construct the new instance.
-     * @param args Parameters to use to construct the instance.
-     */
-    template<typename... Args>
-    constexpr forward_apply(Args &&...args) noexcept(stl::is_nothrow_constructible_v<Func, Args...>)
-        : Func{stl::forward<Args>(args)...} {}
-
-    /**
-     * @brief Forwards and applies the arguments with the underlying function.
-     * @tparam Type Tuple-like type to forward to the underlying function.
-     * @param args Parameters to forward to the underlying function.
-     * @return Return value of the underlying function, if any.
-     */
-    template<typename Type>
-    constexpr decltype(auto) operator()(Type &&args) noexcept(noexcept(stl::apply(stl::declval<Func &>(), args))) {
-        return stl::apply(static_cast<Func &>(*this), stl::forward<Type>(args));
-    }
-
-    /*! @copydoc operator()() */
-    template<typename Type>
-    constexpr decltype(auto) operator()(Type &&args) const noexcept(noexcept(stl::apply(stl::declval<const Func &>(), args))) {
-        return stl::apply(static_cast<const Func &>(*this), stl::forward<Type>(args));
-    }
-};
-
-/**
- * @brief Deduction guide.
- * @tparam Func Type of underlying invocable object.
- */
-template<typename Func>
-forward_apply(Func) -> forward_apply<stl::remove_cvref_t<Func>>;
-
-} // namespace entt
-
-#endif