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// Copyright 2017 The Abseil Authors.
//
// 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
//
// http://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.
//
// Thie file provides the IsStrictlyBaseOfAndConvertibleToSTLContainer type
// trait metafunction to assist in working with the _GLIBCXX_DEBUG debug
// wrappers of STL containers.
//
// DO NOT INCLUDE THIS FILE DIRECTLY. Use this file by including
// absl/strings/str_split.h.
//
// IWYU pragma: private, include "absl/strings/str_split.h"
#ifndef ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
#define ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
#include <array>
#include <bitset>
#include <deque>
#include <forward_list>
#include <list>
#include <map>
#include <set>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "absl/meta/type_traits.h"
namespace absl {
namespace strings_internal {
template <typename C, template <typename...> class T>
struct IsSpecializationImpl : std::false_type {};
template <template <typename...> class T, typename... Args>
struct IsSpecializationImpl<T<Args...>, T> : std::true_type {};
template <typename C, template <typename...> class T>
using IsSpecialization = IsSpecializationImpl<absl::decay_t<C>, T>;
template <typename C>
struct IsArrayImpl : std::false_type {};
template <template <typename, size_t> class A, typename T, size_t N>
struct IsArrayImpl<A<T, N>> : std::is_same<A<T, N>, std::array<T, N>> {};
template <typename C>
using IsArray = IsArrayImpl<absl::decay_t<C>>;
template <typename C>
struct IsBitsetImpl : std::false_type {};
template <template <size_t> class B, size_t N>
struct IsBitsetImpl<B<N>> : std::is_same<B<N>, std::bitset<N>> {};
template <typename C>
using IsBitset = IsBitsetImpl<absl::decay_t<C>>;
template <typename C>
struct IsSTLContainer
: absl::disjunction<
IsArray<C>, IsBitset<C>, IsSpecialization<C, std::deque>,
IsSpecialization<C, std::forward_list>,
IsSpecialization<C, std::list>, IsSpecialization<C, std::map>,
IsSpecialization<C, std::multimap>, IsSpecialization<C, std::set>,
IsSpecialization<C, std::multiset>,
IsSpecialization<C, std::unordered_map>,
IsSpecialization<C, std::unordered_multimap>,
IsSpecialization<C, std::unordered_set>,
IsSpecialization<C, std::unordered_multiset>,
IsSpecialization<C, std::vector>> {};
template <typename C, template <typename...> class T, typename = void>
struct IsBaseOfSpecializationImpl : std::false_type {};
// IsBaseOfSpecializationImpl must have three partial specializations,
// because we must only compare templates that take the same number of
// arguments. Otherwise, for example, std::vector can be compared with std::map,
// and fail to compile because of too few or too many template arguments.
//
// We must also SFINAE on the existence of an allocator_type. Otherwise, we may
// try to compare, for example, a std::pair<std::string, std::string> with a
// std::vector<std::string, std:std::string>. This would fail to compile, because
// of expected properties of the type passed in as the allocator.
template <template <typename, typename> class U,
template <typename, typename> class T, typename... Args>
struct IsBaseOfSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_base_of<U<Args...>, T<Args...>> {};
template <template <typename, typename, typename> class U,
template <typename, typename, typename> class T, typename... Args>
struct IsBaseOfSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_base_of<U<Args...>, T<Args...>> {};
template <template <typename, typename, typename, typename> class U,
template <typename, typename, typename, typename> class T,
typename... Args>
struct IsBaseOfSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_base_of<U<Args...>, T<Args...>> {};
template <typename C, template <typename...> class T>
using IsBaseOfSpecialization = IsBaseOfSpecializationImpl<absl::decay_t<C>, T>;
template <typename C>
struct IsBaseOfArrayImpl : std::false_type {};
template <template <typename, size_t> class A, typename T, size_t N>
struct IsBaseOfArrayImpl<A<T, N>> : std::is_base_of<A<T, N>, std::array<T, N>> {
};
template <typename C>
using IsBaseOfArray = IsBaseOfArrayImpl<absl::decay_t<C>>;
template <typename C>
struct IsBaseOfBitsetImpl : std::false_type {};
template <template <size_t> class B, size_t N>
struct IsBaseOfBitsetImpl<B<N>> : std::is_base_of<B<N>, std::bitset<N>> {};
template <typename C>
using IsBaseOfBitset = IsBaseOfBitsetImpl<absl::decay_t<C>>;
template <typename C>
struct IsBaseOfSTLContainer
: absl::disjunction<IsBaseOfArray<C>, IsBaseOfBitset<C>,
IsBaseOfSpecialization<C, std::deque>,
IsBaseOfSpecialization<C, std::forward_list>,
IsBaseOfSpecialization<C, std::list>,
IsBaseOfSpecialization<C, std::map>,
IsBaseOfSpecialization<C, std::multimap>,
IsBaseOfSpecialization<C, std::set>,
IsBaseOfSpecialization<C, std::multiset>,
IsBaseOfSpecialization<C, std::unordered_map>,
IsBaseOfSpecialization<C, std::unordered_multimap>,
IsBaseOfSpecialization<C, std::unordered_set>,
IsBaseOfSpecialization<C, std::unordered_multiset>,
IsBaseOfSpecialization<C, std::vector>> {};
template <typename C, template <typename...> class T, typename = void>
struct IsConvertibleToSpecializationImpl : std::false_type {};
// IsConvertibleToSpecializationImpl must have three partial specializations,
// because we must only compare templates that take the same number of
// arguments. Otherwise, for example, std::vector can be compared with std::map,
// and fail to compile because of too few or too many template arguments.
//
// We must also SFINAE on the existence of an allocator_type. Otherwise, we may
// try to compare, for example, a std::pair<std::string, std::string> with a
// std::vector<std::string, std:std::string>. This would fail to compile, because
// of expected properties of the type passed in as the allocator.
template <template <typename, typename> class U,
template <typename, typename> class T, typename... Args>
struct IsConvertibleToSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_convertible<U<Args...>, T<Args...>> {};
template <template <typename, typename, typename> class U,
template <typename, typename, typename> class T, typename... Args>
struct IsConvertibleToSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_convertible<U<Args...>, T<Args...>> {};
template <template <typename, typename, typename, typename> class U,
template <typename, typename, typename, typename> class T,
typename... Args>
struct IsConvertibleToSpecializationImpl<
U<Args...>, T, absl::void_t<typename U<Args...>::allocator_type>>
: std::is_convertible<U<Args...>, T<Args...>> {};
template <typename C, template <typename...> class T>
using IsConvertibleToSpecialization =
IsConvertibleToSpecializationImpl<absl::decay_t<C>, T>;
template <typename C>
struct IsConvertibleToArrayImpl : std::false_type {};
template <template <typename, size_t> class A, typename T, size_t N>
struct IsConvertibleToArrayImpl<A<T, N>>
: std::is_convertible<A<T, N>, std::array<T, N>> {};
template <typename C>
using IsConvertibleToArray = IsConvertibleToArrayImpl<absl::decay_t<C>>;
template <typename C>
struct IsConvertibleToBitsetImpl : std::false_type {};
template <template <size_t> class B, size_t N>
struct IsConvertibleToBitsetImpl<B<N>>
: std::is_convertible<B<N>, std::bitset<N>> {};
template <typename C>
using IsConvertibleToBitset = IsConvertibleToBitsetImpl<absl::decay_t<C>>;
template <typename C>
struct IsConvertibleToSTLContainer
: absl::disjunction<
IsConvertibleToArray<C>, IsConvertibleToBitset<C>,
IsConvertibleToSpecialization<C, std::deque>,
IsConvertibleToSpecialization<C, std::forward_list>,
IsConvertibleToSpecialization<C, std::list>,
IsConvertibleToSpecialization<C, std::map>,
IsConvertibleToSpecialization<C, std::multimap>,
IsConvertibleToSpecialization<C, std::set>,
IsConvertibleToSpecialization<C, std::multiset>,
IsConvertibleToSpecialization<C, std::unordered_map>,
IsConvertibleToSpecialization<C, std::unordered_multimap>,
IsConvertibleToSpecialization<C, std::unordered_set>,
IsConvertibleToSpecialization<C, std::unordered_multiset>,
IsConvertibleToSpecialization<C, std::vector>> {};
template <typename C>
struct IsStrictlyBaseOfAndConvertibleToSTLContainer
: absl::conjunction<absl::negation<IsSTLContainer<C>>,
IsBaseOfSTLContainer<C>,
IsConvertibleToSTLContainer<C>> {};
} // namespace strings_internal
} // namespace absl
#endif // ABSL_STRINGS_INTERNAL_STL_TYPE_TRAITS_H_
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