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82a63e350c
This makes it a compile error to use is<T>() where the input and output types are known to be the same at compile time.
60 lines
1.5 KiB
C++
60 lines
1.5 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/Concepts.h>
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#include <AK/Forward.h>
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#include <AK/Platform.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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static_assert(!SameAs<OutputType, InputType>);
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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 bool is(NonnullRefPtr<InputType> const& input)
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{
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return 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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#if USING_AK_GLOBALLY
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using AK::is;
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using AK::verify_cast;
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#endif
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