43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/base/base/unaligned.h
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// and modified by Doris
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#pragma once
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#include <string.h>
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#include <type_traits>
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template <typename T>
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T unaligned_load(const void* address) {
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T res {};
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memcpy(&res, address, sizeof(res));
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return res;
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}
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/// We've had troubles before with wrong store size due to integral promotions
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/// (e.g., unaligned_store(dest, uint16_t + uint16_t) stores an uint32_t).
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/// To prevent this, make the caller specify the stored type explicitly.
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/// To disable deduction of T, wrap the argument type with std::enable_if.
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template <typename T>
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void unaligned_store(void* address, const typename std::enable_if<true, T>::type& src) {
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static_assert(std::is_trivially_copyable_v<T>);
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memcpy(address, &src, sizeof(src));
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}
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