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/*
* Copyright (C) 2024-2025 Samuel Weinig <sam@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <concepts>
namespace WebCore {
// Types can specialize this and set the value to true to be treated as "empty-like"
// for CSS value type algorithms.
// Requirements: None.
template<typename> inline constexpr auto TreatAsEmptyLike = false;
// The `EmptyLike` concept can be used to filter to types that specialize `TreatAsEmptyLike`.
template<typename T> concept EmptyLike = TreatAsEmptyLike<T>;
// Types can specialize this and set the value to true to be treated as "optional-like"
// for CSS value type algorithms.
// Requirements: Types be comparable to bool and have a operator* function.
template<typename> inline constexpr auto TreatAsOptionalLike = false;
// The `OptionalLike` concept can be used to filter to types that specialize `TreatAsOptionalLike`.
template<typename T> concept OptionalLike = TreatAsOptionalLike<T>;
// Types can specialize this and set the value to true to be treated as "tuple-like"
// for CSS value type algorithms.
// NOTE: This gets automatically specialized when using the *_TUPLE_LIKE_CONFORMANCE macros.
// Requirements: Types must have conform the to the standard tuple-like pseudo-protocol.
template<typename> inline constexpr auto TreatAsTupleLike = false;
// The `TupleLike` concept can be used to filter to types that specialize `TreatAsTupleLike`.
template<typename T> concept TupleLike = TreatAsTupleLike<T>;
// Types can specialize this and set the value to true to be treated as "range-like"
// for CSS value type algorithms.
// Requirements: Types must have valid begin()/end() functions.
template<typename> inline constexpr auto TreatAsRangeLike = false;
// The `RangeLike` concept can be used to filter to types that specialize `TreatAsRangeLike`.
template<typename T> concept RangeLike = TreatAsRangeLike<T>;
// Types can specialize this and set the value to true to be treated as "variant-like"
// for CSS value type algorithms.
// Requirements: Types must be able to be passed to WTF::switchOn().
template<typename> inline constexpr auto TreatAsVariantLike = false;
// The `VariantLike` concept can be used to filter to types that specialize `TreatAsVariantLike`.
template<typename T> concept VariantLike = TreatAsVariantLike<T>;
// The `HasIsZero` concept can be used to filter to types that have an `isZero` member function.
template<typename T> concept HasIsZero = requires(T t) {
{ t.isZero() } -> std::convertible_to<bool>;
};
// The `HasIsEmpty` concept can be used to filter to types that have an `isEmpty` member function.
template<typename T> concept HasIsEmpty = requires(T t) {
{ t.isEmpty() } -> std::convertible_to<bool>;
};
} // namespace WebCore
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