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/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Platform.h>
#include <AK/StdLibExtras.h>
namespace AK {
template<typename OutputType, typename InputType>
ALWAYS_INLINE bool is(InputType& input)
{
if constexpr (requires { input.template fast_is<OutputType>(); }) {
return input.template fast_is<OutputType>();
}
return dynamic_cast<CopyConst<InputType, OutputType>*>(&input);
}
template<typename OutputType, typename InputType>
ALWAYS_INLINE bool is(InputType* input)
{
return input && is<OutputType>(*input);
}
template<typename OutputType, typename InputType>
ALWAYS_INLINE CopyConst<InputType, OutputType>* downcast(InputType* input)
{
static_assert(IsBaseOf<InputType, OutputType>);
VERIFY(!input || is<OutputType>(*input));
return static_cast<CopyConst<InputType, OutputType>*>(input);
}
template<typename OutputType, typename InputType>
ALWAYS_INLINE CopyConst<InputType, OutputType>& downcast(InputType& input)
{
static_assert(IsBaseOf<InputType, OutputType>);
VERIFY(is<OutputType>(input));
return static_cast<CopyConst<InputType, OutputType>&>(input);
}
}
using AK::downcast;
using AK::is;
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