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https://github.com/SerenityOS/serenity
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ee3a73ddbb
This makes it much clearer what this cast actually does: it will VERIFY that the thing we're casting is a T (using is<T>()).
50 lines
1.3 KiB
C++
50 lines
1.3 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>* verify_cast(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>& verify_cast(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::is;
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using AK::verify_cast;
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