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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Platform.h>
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#include <AK/StdLibExtras.h>
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namespace AK {
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template<typename OutputType, typename InputType>
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ALWAYS_INLINE bool is(InputType& input)
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{
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if constexpr (requires { input.template fast_is<OutputType>(); }) {
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return input.template fast_is<OutputType>();
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}
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return dynamic_cast<CopyConst<InputType, OutputType>*>(&input);
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}
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template<typename OutputType, typename InputType>
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ALWAYS_INLINE bool is(InputType* input)
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{
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return input && is<OutputType>(*input);
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}
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template<typename OutputType, typename InputType>
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ALWAYS_INLINE CopyConst<InputType, OutputType>* downcast(InputType* input)
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{
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static_assert(IsBaseOf<InputType, OutputType>);
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VERIFY(!input || is<OutputType>(*input));
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return static_cast<CopyConst<InputType, OutputType>*>(input);
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}
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template<typename OutputType, typename InputType>
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ALWAYS_INLINE CopyConst<InputType, OutputType>& downcast(InputType& input)
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{
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static_assert(IsBaseOf<InputType, OutputType>);
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VERIFY(is<OutputType>(input));
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return static_cast<CopyConst<InputType, OutputType>&>(input);
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}
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}
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using AK::downcast;
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using AK::is;
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