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ce2c5b375c
Let's unify the is<T>/to<T> implementations that currently exist in separate versions in LibCore and LibWeb.
94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in input and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of input code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/StdLibExtras.h>
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namespace AK {
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template<typename OutputType, typename InputType, bool is_base_type = IsBaseOf<OutputType, InputType>::value>
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struct TypeTraits {
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static bool has_type(InputType&)
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{
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static_assert(IsVoid<OutputType>::value, "No TypeTraits for this type");
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return false;
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}
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};
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template<typename OutputType, typename InputType>
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struct TypeTraits<OutputType, InputType, true> {
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static bool has_type(InputType&) { return true; }
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};
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template<typename OutputType, typename InputType>
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inline bool is(InputType* input)
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{
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return input && TypeTraits<const OutputType, const InputType>::has_type(*input);
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}
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template<typename OutputType, typename InputType>
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inline bool is(InputType& input)
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{
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return TypeTraits<const OutputType, const InputType>::has_type(input);
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}
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template<typename OutputType, typename InputType>
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inline CopyConst<InputType, OutputType>* downcast(InputType* input)
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{
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static_assert(IsBaseOf<InputType, OutputType>::value);
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ASSERT(!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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inline CopyConst<InputType, OutputType>& downcast(InputType& input)
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{
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static_assert(IsBaseOf<InputType, OutputType>::value);
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ASSERT(is<OutputType>(input));
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return static_cast<CopyConst<InputType, OutputType>&>(input);
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}
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#define AK_BEGIN_TYPE_TRAITS(ClassName) \
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namespace AK { \
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template<typename InputType> \
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class TypeTraits<const ClassName, InputType, false> { \
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public: \
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static bool has_type(InputType& input) { return is_type(input); } \
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\
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private:
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#define AK_END_TYPE_TRAITS() \
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} \
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; \
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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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using AK::TypeTraits;
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