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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR 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 <type_traits>
#include <wtf/Forward.h>
// SFINAE depends on overload resolution. We indicate the overload we'd prefer
// (if it can compile) using a higher priorty type (int), and the overload
// to fall back to using a lower priority type (long). 0 can convert to int
// or long, so we can trigger overload resolution using 0. C++ is awesome!
#define SFINAE_OVERLOAD 0
#define SFINAE_OVERLOAD_DEFAULT long
#define SFINAE_OVERLOAD_PREFERRED int
namespace WTF {
namespace detail {
// IsRefcountedSmartPointer implementation.
template<typename CVRemoved>
struct IsRefcountedSmartPointerHelper : std::false_type { };
template<typename Pointee>
struct IsRefcountedSmartPointerHelper<RefPtr<Pointee>> : std::true_type { };
template<typename Pointee>
struct IsRefcountedSmartPointerHelper<Ref<Pointee>> : std::true_type { };
} // namespace detail
template<typename T>
struct IsRefcountedSmartPointer : detail::IsRefcountedSmartPointerHelper<std::remove_cv_t<T>> { };
// IsSmartRef implementation
namespace detail {
template<typename CVRemoved>
struct IsSmartRefHelper : std::false_type { };
template<typename Pointee>
struct IsSmartRefHelper<Ref<Pointee>> : std::true_type { };
} // namespace detail
template<typename T>
struct IsSmartRef : detail::IsSmartRefHelper<std::remove_cv_t<T>> { };
// RemoveSmartPointer implementation
namespace detail {
template<typename T, typename CVRemoved>
struct RemoveSmartPointerHelper {
typedef T type;
};
template<typename T, typename Pointee>
struct RemoveSmartPointerHelper<T, RefPtr<Pointee>> {
typedef Pointee type;
};
template<typename T, typename Pointee>
struct RemoveSmartPointerHelper<T, Ref<Pointee>> {
typedef Pointee type;
};
} // namespace detail
template<typename T>
struct RemoveSmartPointer : detail::RemoveSmartPointerHelper<T, std::remove_cv_t<T>> { };
// HasRefPtrMemberFunctions implementation
namespace detail {
template<typename>
struct SFINAE1True : std::true_type { };
template<class T>
static auto HasRefPtrMemberFunctionsTest(SFINAE_OVERLOAD_PREFERRED) -> SFINAE1True<decltype(static_cast<std::remove_cv_t<T>*>(nullptr)->ref(), static_cast<std::remove_cv_t<T>*>(nullptr)->deref())>;
template<class>
static auto HasRefPtrMemberFunctionsTest(SFINAE_OVERLOAD_DEFAULT) -> std::false_type;
} // namespace detail
template<class T>
struct HasRefPtrMemberFunctions : decltype(detail::HasRefPtrMemberFunctionsTest<T>(SFINAE_OVERLOAD)) { };
// HasCheckedPtrMemberFunctions implementation
namespace detail {
template<class T>
static auto HasCheckedPtrMemberFunctionsTest(SFINAE_OVERLOAD_PREFERRED) -> SFINAE1True<decltype(static_cast<std::remove_cv_t<T>*>(nullptr)->incrementCheckedPtrCount(), static_cast<std::remove_cv_t<T>*>(nullptr)->decrementCheckedPtrCount())>;
template<class>
static auto HasCheckedPtrMemberFunctionsTest(SFINAE_OVERLOAD_DEFAULT) -> std::false_type;
} // namespace detail
template<class T>
struct HasCheckedPtrMemberFunctions : decltype(detail::HasCheckedPtrMemberFunctionsTest<T>(SFINAE_OVERLOAD)) { };
// HasIsolatedCopy()
namespace detail {
// FIXME: This test is incorrectly false for RefCounted objects because
// substitution for std::declval<T>() fails when the constructor is private.
template<class T>
static auto HasIsolatedCopyTest(SFINAE_OVERLOAD_PREFERRED) -> SFINAE1True<decltype(std::declval<T>().isolatedCopy())>;
template<class>
static auto HasIsolatedCopyTest(SFINAE_OVERLOAD_DEFAULT) -> std::false_type;
} // namespace detail
template<class T>
struct HasIsolatedCopy : decltype(detail::HasIsolatedCopyTest<T>(SFINAE_OVERLOAD)) { };
// LooksLikeRCSerialDispatcher implementation
namespace detail {
template <bool b, typename>
struct SFINAE1If : std::integral_constant<bool, b> { };
template <bool b, class T>
static auto LooksLikeRCSerialDispatcherTest(SFINAE_OVERLOAD_PREFERRED)
-> SFINAE1If<b, decltype(std::declval<T>().ref(), std::declval<T>().deref())>;
template <bool, typename>
static auto LooksLikeRCSerialDispatcherTest(SFINAE_OVERLOAD_DEFAULT) -> std::false_type;
} // namespace detail
template <class T>
struct LooksLikeRCSerialDispatcher : decltype(detail::LooksLikeRCSerialDispatcherTest<std::is_base_of_v<SerialFunctionDispatcher, T>, T>(SFINAE_OVERLOAD)) { };
class NativePromiseBase;
class ConvertibleToNativePromise;
template <typename T>
concept IsNativePromise = std::is_base_of<NativePromiseBase, T>::value;
template <typename T>
concept IsConvertibleToNativePromise = std::is_base_of<ConvertibleToNativePromise, T>::value;
template <typename T, typename U>
concept RelatedNativePromise = requires(T, U)
{
{ IsConvertibleToNativePromise<T> };
{ IsConvertibleToNativePromise<U> };
{ std::is_same<typename T::PromiseType, typename U::PromiseType>::value };
};
template <typename T>
struct IsExpected : std::false_type { };
template <typename T, typename E>
struct IsExpected<Expected<T, E>> : std::true_type { };
template <typename... Args>
struct ParameterCountImpl {
static constexpr std::size_t value = sizeof...(Args);
};
template <typename ReturnType, typename... Args>
constexpr std::size_t parameterCount(ReturnType(*)(Args...))
{
return ParameterCountImpl<Args...>::value;
}
} // namespace NTF
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