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Diffstat (limited to 'utility/BinaryCopy.hpp')
| -rw-r--r-- | utility/BinaryCopy.hpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/utility/BinaryCopy.hpp b/utility/BinaryCopy.hpp new file mode 100644 index 0000000..ada6a18 --- /dev/null +++ b/utility/BinaryCopy.hpp @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2015, Intel Corporation + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source 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. + * + * 3. Neither the name of the copyright holder nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * 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. + */ + +#include <algorithm> +#include <type_traits> +#include "Iterator.hpp" +#include <cassert> + +namespace utility +{ + +/** + * Raw copy of one variable to another of the same size + * + * This can be regarder as a reinterpret_cast but does a copy and does not + * break strict-aliasing rules. + * + * The source and the destination must have the same storage size (e.g. copying + * a uint8_t into a uint32_t won't compile) + * + * @tparam Source The source type + * @tparam Destination the destination type (even if it is a reference, this + * function returns by copy) + * @param source Source variable + * @returns the source, reinterpreted as the destination type + */ +template <class Destination, class Source> +typename std::remove_reference<Destination>::type binaryCopy(const Source source) +{ + static_assert(sizeof(Source) == sizeof(Destination), + "Source and Destination must have the same size"); + + using Destination_ = decltype(binaryCopy<Destination>(source)); + + union + { + Source source; + Destination_ destination; + } hack; + + hack.source = source; + return hack.destination; +} + +} // namespace utility |
