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667b417d9f
The return value is always be 'count', even in the case of 0. Note that the return value of TypedTransfer::copy() is likewise uninteresting, but apparently it is beig used. Hence this patch does not touch it.
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source 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 source 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/Traits.h>
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namespace AK {
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template<typename T>
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class TypedTransfer {
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public:
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static void move(T* destination, T* source, size_t count)
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{
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if (!count)
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return;
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if constexpr (Traits<T>::is_trivial()) {
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__builtin_memmove(destination, source, count * sizeof(T));
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return;
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}
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for (size_t i = 0; i < count; ++i) {
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if (destination <= source)
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new (&destination[i]) T(AK::move(source[i]));
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else
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new (&destination[count - i - 1]) T(AK::move(source[count - i - 1]));
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}
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return;
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}
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static size_t copy(T* destination, const T* source, size_t count)
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{
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if (!count)
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return 0;
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if constexpr (Traits<T>::is_trivial()) {
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__builtin_memmove(destination, source, count * sizeof(T));
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return count;
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}
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for (size_t i = 0; i < count; ++i) {
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if (destination <= source)
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new (&destination[i]) T(source[i]);
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else
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new (&destination[count - i - 1]) T(source[count - i - 1]);
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}
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return count;
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}
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static bool compare(const T* a, const T* b, size_t count)
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{
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if (!count)
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return true;
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if constexpr (Traits<T>::is_trivial())
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return !__builtin_memcmp(a, b, count * sizeof(T));
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for (size_t i = 0; i < count; ++i) {
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if (a[i] != b[i])
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return false;
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}
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return true;
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}
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};
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}
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