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Diffstat (limited to 'src/third-party/scnlib/include/scn/ranges/util.h')
| -rw-r--r-- | src/third-party/scnlib/include/scn/ranges/util.h | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/src/third-party/scnlib/include/scn/ranges/util.h b/src/third-party/scnlib/include/scn/ranges/util.h new file mode 100644 index 0000000..d5954d1 --- /dev/null +++ b/src/third-party/scnlib/include/scn/ranges/util.h @@ -0,0 +1,419 @@ +// Copyright 2017 Elias Kosunen +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// This file is a part of scnlib: +// https://github.com/eliaskosunen/scnlib +// +// The contents of this file are adapted from NanoRange. +// https://github.com/tcbrindle/NanoRange +// Copyright (c) 2018 Tristan Brindle +// Distributed under the Boost Software License, Version 1.0 + +#ifndef SCN_RANGES_UTIL_H +#define SCN_RANGES_UTIL_H + +#include "../util/meta.h" + +namespace scn { + SCN_BEGIN_NAMESPACE + + namespace custom_ranges { + namespace detail { + template <size_t N> + using priority_tag = ::scn::detail::priority_tag<N>; + + template <typename... Ts> + using void_t = ::scn::detail::void_t<Ts...>; + + template <typename T> + using static_const = ::scn::detail::static_const<T>; + + template <typename T> + using remove_cvref_t = ::scn::detail::remove_cvref_t<T>; + + template <typename T> + constexpr typename std::decay<T>::type decay_copy(T&& t) noexcept( + noexcept(static_cast<typename std::decay<T>::type>(SCN_FWD(t)))) + { + return SCN_FWD(t); + } + + struct nonesuch { + nonesuch() = delete; + nonesuch(nonesuch const&) = delete; + nonesuch& operator=(const nonesuch&) = delete; + ~nonesuch() = delete; + }; + + template <typename Void, + template <class...> + class Trait, + typename... Args> + struct test { + using type = nonesuch; + }; + + template <template <class...> class Trait, typename... Args> + struct test<void_t<Trait<Args...>>, Trait, Args...> { + using type = Trait<Args...>; + }; + + template <template <class...> class Trait, typename... Args> + using test_t = typename test<void, Trait, Args...>::type; + + template <typename Void, + template <class...> + class AliasT, + typename... Args> + struct exists_helper : std::false_type { + }; + + template <template <class...> class AliasT, typename... Args> + struct exists_helper<void_t<AliasT<Args...>>, AliasT, Args...> + : std::true_type { + }; + + template <template <class...> class AliasT, typename... Args> + struct exists : exists_helper<void, AliasT, Args...> { + }; + + template <typename R, + typename... Args, + typename = decltype(&R::template _test_requires<Args...>)> + auto test_requires(R&) -> void; + + template <typename R, typename... Args> + using test_requires_t = + decltype(test_requires<R, Args...>(SCN_DECLVAL(R&))); + + template <typename R, typename... Args> + struct _requires : exists<test_requires_t, R, Args...> { + }; + + template <bool Expr> + using requires_expr = typename std::enable_if<Expr, int>::type; + + template <typename...> + struct get_common_type; + + template <typename T, typename U> + struct copy_cv { + using type = U; + }; + template <typename T, typename U> + struct copy_cv<const T, U> { + using type = typename std::add_const<U>::type; + }; + template <typename T, typename U> + struct copy_cv<volatile T, U> { + using type = typename std::add_volatile<U>::type; + }; + template <typename T, typename U> + struct copy_cv<const volatile T, U> { + using type = typename std::add_cv<U>::type; + }; + template <typename T, typename U> + using copy_cv_t = typename copy_cv<T, U>::type; + + template <typename T> + using cref_t = typename std::add_lvalue_reference< + const typename std::remove_reference<T>::type>::type; + + template <typename T> + struct rref_res { + using type = T; + }; + template <typename T> + struct rref_res<T&> { + using type = typename std::remove_reference<T>::type&&; + }; + template <typename T> + using rref_res_t = typename rref_res<T>::type; + + template <typename T, typename U> + using cond_res_t = + decltype(SCN_DECLVAL(bool) ? std::declval<T (&)()>()() + : std::declval<U (&)()>()()); + + template <typename T, typename U> + struct simple_common_reference { + }; + + template < + typename T, + typename U, + typename C = + test_t<cond_res_t, copy_cv_t<T, U>&, copy_cv_t<U, T>&>> + struct lvalue_simple_common_reference + : std::enable_if<std::is_reference<C>::value, C> { + }; + template <typename T, typename U> + using lvalue_scr_t = + typename lvalue_simple_common_reference<T, U>::type; + template <typename T, typename U> + struct simple_common_reference<T&, U&> + : lvalue_simple_common_reference<T, U> { + }; + + template <typename T, + typename U, + typename LCR = test_t<lvalue_scr_t, T, U>, + typename C = rref_res_t<LCR>> + struct rvalue_simple_common_reference + : std::enable_if<std::is_convertible<T&&, C>::value && + std::is_convertible<U&&, C>::value>::type { + }; + template <typename T, typename U> + struct simple_common_reference<T&&, U&&> + : rvalue_simple_common_reference<T, U> { + }; + + template <typename A, + typename B, + typename C = test_t<lvalue_scr_t, A, const B>> + struct mixed_simple_common_reference + : std::enable_if<std::is_convertible<B&&, C>::value, C>::type { + }; + + template <typename A, typename B> + struct simple_common_reference<A&, B&&> + : mixed_simple_common_reference<A, B> { + }; + template <typename A, typename B> + struct simple_common_reference<A&&, B&> + : simple_common_reference<B&&, A&> { + }; + template <typename T, typename U> + using simple_common_reference_t = + typename simple_common_reference<T, U>::type; + + template <typename> + struct xref { + template <typename U> + using type = U; + }; + + template <typename A> + struct xref<A&> { + template <typename U> + using type = typename std::add_lvalue_reference< + typename xref<A>::template type<U>>::type; + }; + + template <typename A> + struct xref<A&&> { + template <typename U> + using type = typename std::add_rvalue_reference< + typename xref<A>::template type<U>>::type; + }; + + template <typename A> + struct xref<const A> { + template <typename U> + using type = typename std::add_const< + typename xref<A>::template type<U>>::type; + }; + + template <typename A> + struct xref<volatile A> { + template <typename U> + using type = typename std::add_volatile< + typename xref<A>::template type<U>>::type; + }; + + template <typename A> + struct xref<const volatile A> { + template <typename U> + using type = typename std::add_cv< + typename xref<A>::template type<U>>::type; + }; + + template <typename T, + typename U, + template <class> + class TQual, + template <class> + class UQual> + struct basic_common_reference { + }; + + template <typename...> + struct get_common_reference; + template <typename... Ts> + using get_common_reference_t = + typename get_common_reference<Ts...>::type; + + template <> + struct get_common_reference<> { + }; + template <typename T0> + struct get_common_reference<T0> { + using type = T0; + }; + + template <typename T, typename U> + struct has_simple_common_ref + : exists<simple_common_reference_t, T, U> { + }; + template <typename T, typename U> + using basic_common_ref_t = typename basic_common_reference< + ::scn::detail::remove_cvref_t<T>, + ::scn::detail::remove_cvref_t<U>, + xref<T>::template type, + xref<U>::template type>::type; + + template <typename T, typename U> + struct has_basic_common_ref : exists<basic_common_ref_t, T, U> { + }; + template <typename T, typename U> + struct has_cond_res : exists<cond_res_t, T, U> { + }; + + template <typename T, typename U, typename = void> + struct binary_common_ref : get_common_type<T, U> { + }; + template <typename T, typename U> + struct binary_common_ref< + T, + U, + typename std::enable_if< + has_simple_common_ref<T, U>::value>::type> + : simple_common_reference<T, U> { + }; + template <typename T, typename U> + struct binary_common_ref< + T, + U, + typename std::enable_if< + has_basic_common_ref<T, U>::value && + !has_simple_common_ref<T, U>::value>::type> { + using type = basic_common_ref_t<T, U>; + }; + template <typename T, typename U> + struct binary_common_ref< + T, + U, + typename std::enable_if< + has_cond_res<T, U>::value && + !has_basic_common_ref<T, U>::value && + !has_simple_common_ref<T, U>::value>::type> { + using type = cond_res_t<T, U>; + }; + template <typename T1, typename T2> + struct get_common_reference<T1, T2> : binary_common_ref<T1, T2> { + }; + + template <typename Void, typename T1, typename T2, typename... Rest> + struct multiple_common_reference { + }; + template <typename T1, typename T2, typename... Rest> + struct multiple_common_reference< + void_t<get_common_reference_t<T1, T2>>, + T1, + T2, + Rest...> : get_common_reference<get_common_reference_t<T1, T2>, + Rest...> { + }; + template <typename T1, typename T2, typename... Rest> + struct get_common_reference<T1, T2, Rest...> + : multiple_common_reference<void, T1, T2, Rest...> { + }; + + template <typename... Ts> + using get_common_type_t = typename get_common_type<Ts...>::type; + + template <typename T, typename U> + struct _same_decayed + : std::integral_constant< + bool, + std::is_same<T, typename std::decay<T>::type>::value && + std::is_same<U, + typename std::decay<U>::type>::value> { + }; + + template <typename T, typename U> + using ternary_return_t = + typename std::decay<decltype(false ? SCN_DECLVAL(T) + : SCN_DECLVAL(U))>::type; + + template <typename, typename, typename = void> + struct binary_common_type { + }; + + template <typename T, typename U> + struct binary_common_type< + T, + U, + typename std::enable_if<!_same_decayed<T, U>::value>::type> + : get_common_type<typename std::decay<T>::type, + typename std::decay<U>::type> { + }; + + template <typename T, typename U> + struct binary_common_type< + T, + U, + typename std::enable_if< + _same_decayed<T, U>::value && + exists<ternary_return_t, T, U>::value>::type> { + using type = ternary_return_t<T, U>; + }; + + template <typename T, typename U> + struct binary_common_type< + T, + U, + typename std::enable_if< + _same_decayed<T, U>::value && + !exists<ternary_return_t, T, U>::value && + exists<cond_res_t, cref_t<T>, cref_t<U>>::value>::type> { + using type = + typename std::decay<cond_res_t<cref_t<T>, cref_t<U>>>::type; + }; + + template <> + struct get_common_type<> { + }; + + template <typename T> + struct get_common_type<T> : get_common_type<T, T> { + }; + + template <typename T, typename U> + struct get_common_type<T, U> : binary_common_type<T, U> { + }; + + template <typename Void, typename...> + struct multiple_common_type { + }; + + template <typename T1, typename T2, typename... R> + struct multiple_common_type<void_t<get_common_type_t<T1, T2>>, + T1, + T2, + R...> + : get_common_type<get_common_type_t<T1, T2>, R...> { + }; + + template <typename T1, typename T2, typename... R> + struct get_common_type<T1, T2, R...> + : multiple_common_type<void, T1, T2, R...> { + }; + } // namespace detail + } // namespace custom_ranges + + SCN_END_NAMESPACE +} // namespace scn + +#endif // SCN_RANGES_UTIL_H |