142 lines
4 KiB
C++
142 lines
4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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namespace base {
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namespace details {
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template <
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typename Type,
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typename Operator,
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typename = decltype(Operator{}(
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std::declval<Type>(),
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std::declval<Type>()))>
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char test_operator(const Type &, const Operator &);
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int test_operator(...);
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template <typename Type, template <typename> typename Operator>
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struct has_operator
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: std::bool_constant<
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sizeof(test_operator(
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std::declval<Type>(),
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std::declval<Operator<Type>>()
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)) == sizeof(char)> {
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};
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template <
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typename Type,
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template <typename> typename Operator>
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constexpr bool has_operator_v
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= has_operator<Type, Operator>::value;
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template <typename Type>
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constexpr bool has_less_v = has_operator_v<Type, std::less>;
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template <typename Type>
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constexpr bool has_greater_v = has_operator_v<Type, std::greater>;
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template <typename Type>
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constexpr bool has_less_equal_v = has_operator_v<Type, std::less_equal>;
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template <typename Type>
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constexpr bool has_greater_equal_v = has_operator_v<Type, std::greater_equal>;
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template <typename Type>
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constexpr bool has_equal_to_v = has_operator_v<Type, std::equal_to>;
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template <typename Type>
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constexpr bool has_not_equal_to_v = has_operator_v<Type, std::not_equal_to>;
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} // namespace details
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} // namespace base
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator<(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<base::details::has_less_v<Helper>, bool> {
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return value_ordering_helper(a) < value_ordering_helper(b);
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}
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator>(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<
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base::details::has_greater_v<Helper>
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|| base::details::has_less_v<Helper>,
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bool
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> {
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if constexpr (base::details::has_greater_v<Helper>) {
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return value_ordering_helper(a) > value_ordering_helper(b);
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} else {
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return value_ordering_helper(b) < value_ordering_helper(a);
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}
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}
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator<=(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<
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base::details::has_less_equal_v<Helper>
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|| base::details::has_less_v<Helper>,
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bool
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> {
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if constexpr (base::details::has_less_equal_v<Helper>) {
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return value_ordering_helper(a) <= value_ordering_helper(b);
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} else {
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return !(value_ordering_helper(b) < value_ordering_helper(a));
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}
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}
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator>=(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<
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base::details::has_greater_equal_v<Helper>
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|| base::details::has_less_v<Helper>,
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bool
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> {
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if constexpr (base::details::has_greater_equal_v<Helper>) {
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return value_ordering_helper(a) >= value_ordering_helper(b);
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} else {
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return !(value_ordering_helper(a) < value_ordering_helper(b));
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}
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}
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator==(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<base::details::has_equal_to_v<Helper>, bool> {
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return value_ordering_helper(a) == value_ordering_helper(b);
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}
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template <
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typename ValueType,
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typename Helper = decltype(
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value_ordering_helper(std::declval<ValueType>()))>
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inline auto operator!=(const ValueType &a, const ValueType &b)
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-> std::enable_if_t<
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base::details::has_not_equal_to_v<Helper>
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|| base::details::has_equal_to_v<Helper>,
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bool
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> {
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if constexpr (base::details::has_not_equal_to_v<Helper>) {
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return value_ordering_helper(a) != value_ordering_helper(b);
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} else {
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return !(value_ordering_helper(a) == value_ordering_helper(b));
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}
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}
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