mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 07:30:19 +00:00
ce2c5b375c
Let's unify the is<T>/to<T> implementations that currently exist in separate versions in LibCore and LibWeb.
93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in input and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of input code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/StdLibExtras.h>
|
|
|
|
namespace AK {
|
|
|
|
template<typename OutputType, typename InputType, bool is_base_type = IsBaseOf<OutputType, InputType>::value>
|
|
struct TypeTraits {
|
|
static bool has_type(InputType&)
|
|
{
|
|
static_assert(IsVoid<OutputType>::value, "No TypeTraits for this type");
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename OutputType, typename InputType>
|
|
struct TypeTraits<OutputType, InputType, true> {
|
|
static bool has_type(InputType&) { return true; }
|
|
};
|
|
|
|
template<typename OutputType, typename InputType>
|
|
inline bool is(InputType* input)
|
|
{
|
|
return input && TypeTraits<const OutputType, const InputType>::has_type(*input);
|
|
}
|
|
|
|
template<typename OutputType, typename InputType>
|
|
inline bool is(InputType& input)
|
|
{
|
|
return TypeTraits<const OutputType, const InputType>::has_type(input);
|
|
}
|
|
|
|
template<typename OutputType, typename InputType>
|
|
inline CopyConst<InputType, OutputType>* downcast(InputType* input)
|
|
{
|
|
static_assert(IsBaseOf<InputType, OutputType>::value);
|
|
ASSERT(!input || is<OutputType>(*input));
|
|
return static_cast<CopyConst<InputType, OutputType>*>(input);
|
|
}
|
|
|
|
template<typename OutputType, typename InputType>
|
|
inline CopyConst<InputType, OutputType>& downcast(InputType& input)
|
|
{
|
|
static_assert(IsBaseOf<InputType, OutputType>::value);
|
|
ASSERT(is<OutputType>(input));
|
|
return static_cast<CopyConst<InputType, OutputType>&>(input);
|
|
}
|
|
|
|
#define AK_BEGIN_TYPE_TRAITS(ClassName) \
|
|
namespace AK { \
|
|
template<typename InputType> \
|
|
class TypeTraits<const ClassName, InputType, false> { \
|
|
public: \
|
|
static bool has_type(InputType& input) { return is_type(input); } \
|
|
\
|
|
private:
|
|
|
|
#define AK_END_TYPE_TRAITS() \
|
|
} \
|
|
; \
|
|
}
|
|
|
|
}
|
|
|
|
using AK::downcast;
|
|
using AK::is;
|
|
using AK::TypeTraits;
|