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#ifndef QCONTAINERINFO_H
#define QCONTAINERINFO_H

#include <QtCore/qglobal.h>
#include <type_traits>

QT_BEGIN_NAMESPACE

namespace QContainerTraits
{

template<typename C>
using value_type = typename C::value_type;

template<typename C>
using iterator = typename C::iterator;

template<typename C>
using const_iterator = typename C::const_iterator;

// Some versions of Apple clang warn about the constexpr variables below being unused.
QT_WARNING_PUSH
QT_WARNING_DISABLE_CLANG("-Wunused-const-variable")

template<typename C, typename = void>
constexpr bool has_size_v = false;
template<typename C>
constexpr bool has_size_v<C, std::void_t<decltype(C().size())>> = true;

template<typename C, typename = void>
constexpr bool has_clear_v = false;
template<typename C>
constexpr bool has_clear_v<C, std::void_t<decltype(C().clear())>> = true;

template<typename, typename = void>
constexpr bool has_at_v = false;
template<typename C>
constexpr bool has_at_v<C, std::void_t<decltype(C().at(0))>> = true;

template<typename, typename = void>
constexpr bool can_get_at_index_v = false;
template<typename C>
constexpr bool can_get_at_index_v<C, std::void_t<value_type<C>(decltype(C()[0]))>> = true;

template<typename, typename = void>
constexpr bool can_set_at_index_v = false;
template<typename C>
constexpr bool can_set_at_index_v<C, std::void_t<decltype(C()[0] = value_type<C>())>> = true;

template<typename, typename = void>
constexpr bool has_push_front_v = false;
template<typename C>
constexpr bool has_push_front_v<C, std::void_t<decltype(C().push_front(value_type<C>()))>> = true;

template<typename, typename = void>
constexpr bool has_push_back_v = false;
template<typename C>
constexpr bool has_push_back_v<C, std::void_t<decltype(C().push_back(value_type<C>()))>> = true;

template<typename, typename = void>
constexpr bool has_insert_v = false;
template<typename C>
constexpr bool has_insert_v<C, std::void_t<decltype(C().insert(value_type<C>()))>> = true;

template<typename, typename = void>
constexpr bool has_pop_front_v = false;
template<typename C>
constexpr bool has_pop_front_v<C, std::void_t<decltype(C().pop_front())>> = true;

template<typename, typename = void>
constexpr bool has_pop_back_v = false;
template<typename C>
constexpr bool has_pop_back_v<C, std::void_t<decltype(C().pop_back())>> = true;

template<typename, typename = void>
constexpr bool has_iterator_v = false;
template<typename C>
constexpr bool has_iterator_v<C, std::void_t<iterator<C>>> = true;

template<typename, typename = void>
constexpr bool has_const_iterator_v = false;
template<typename C>
constexpr bool has_const_iterator_v<C, std::void_t<const_iterator<C>>> = true;

template<typename, typename = void>
constexpr bool can_get_at_iterator_v = false;
template<typename C>
constexpr bool can_get_at_iterator_v<C, std::void_t<value_type<C>(decltype(*C().begin()))>> = true;

template<typename, typename = void>
constexpr bool can_set_at_iterator_v = false;
template<typename C>
constexpr bool can_set_at_iterator_v<C, std::void_t<decltype(*C().begin() = value_type<C>())>> = true;

template<typename, typename = void>
constexpr bool can_insert_at_iterator_v = false;
template<typename C>
constexpr bool can_insert_at_iterator_v<C, std::void_t<decltype(C().insert(C().begin(), value_type<C>()))>> = true;

template<typename, typename = void>
constexpr bool can_erase_at_iterator_v = false;
template<typename C>
constexpr bool can_erase_at_iterator_v<C, std::void_t<decltype(C().erase(C().begin()))>> = true;

template<typename, typename = void>
constexpr bool can_erase_range_at_iterator_v = false;
template<typename C>
constexpr bool can_erase_range_at_iterator_v<C, std::void_t<decltype(C().erase(C().begin(), C().end()))>> = true;

QT_WARNING_POP

}

QT_END_NAMESPACE

#endif // QCONTAINERINFO_H