1 /* 2 * Copyright (c) 2015, Intel Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation and/or 13 * other materials provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors 16 * may be used to endorse or promote products derived from this software without 17 * specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <algorithm> 32 #include <type_traits> 33 #include "Iterator.hpp" 34 #include <cassert> 35 36 namespace utility 37 { 38 39 /** 40 * Raw copy of one variable to another of the same size 41 * 42 * This can be regarder as a reinterpret_cast but does a copy and does not 43 * break strict-aliasing rules. 44 * 45 * The source and the destination must have the same storage size (e.g. copying 46 * a uint8_t into a uint32_t won't compile) 47 * 48 * @tparam Source The source type 49 * @tparam Destination the destination type (even if it is a reference, this 50 * function returns by copy) 51 * @param source Source variable 52 * @returns the source, reinterpreted as the destination type 53 */ 54 template <class Destination, class Source> 55 typename std::remove_reference<Destination>::type binaryCopy(const Source source) 56 { 57 static_assert(sizeof(Source) == sizeof(Destination), 58 "Source and Destination must have the same size"); 59 60 using Destination_ = decltype(binaryCopy<Destination>(source)); 61 62 union 63 { 64 Source source; 65 Destination_ destination; 66 } hack; 67 68 hack.source = source; 69 return hack.destination; 70 } 71 72 } // namespace utility 73
