1/////////////////////////////////////////////////////////////////////////////// 2// 3// Copyright (c) 2015 Microsoft Corporation. All rights reserved. 4// 5// This code is licensed under the MIT License (MIT). 6// 7// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 8// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 9// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 10// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 11// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 12// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 13// THE SOFTWARE. 14// 15/////////////////////////////////////////////////////////////////////////////// 16 17#ifndef GSL_ALGORITHM_H 18#define GSL_ALGORITHM_H 19 20#include <gsl/gsl_assert> // for Expects 21#include <gsl/span> // for dynamic_extent, span 22 23#include <algorithm> // for copy_n 24#include <cstddef> // for ptrdiff_t 25#include <type_traits> // for is_assignable 26 27#ifdef _MSC_VER 28#pragma warning(push) 29 30// turn off some warnings that are noisy about our Expects statements 31#pragma warning(disable : 4127) // conditional expression is constant 32#pragma warning(disable : 4996) // unsafe use of std::copy_n 33 34#endif // _MSC_VER 35 36namespace gsl 37{ 38// Note: this will generate faster code than std::copy using span iterator in older msvc+stl 39// not necessary for msvc since VS2017 15.8 (_MSC_VER >= 1915) 40template <class SrcElementType, std::ptrdiff_t SrcExtent, class DestElementType, 41 std::ptrdiff_t DestExtent> 42void copy(span<SrcElementType, SrcExtent> src, span<DestElementType, DestExtent> dest) 43{ 44 static_assert(std::is_assignable<decltype(*dest.data()), decltype(*src.data())>::value, 45 "Elements of source span can not be assigned to elements of destination span"); 46 static_assert(SrcExtent == dynamic_extent || DestExtent == dynamic_extent || 47 (SrcExtent <= DestExtent), 48 "Source range is longer than target range"); 49 50 Expects(dest.size() >= src.size()); 51 GSL_SUPPRESS(stl.1) // NO-FORMAT: attribute 52 std::copy_n(src.data(), src.size(), dest.data()); 53} 54 55} // namespace gsl 56 57#ifdef _MSC_VER 58#pragma warning(pop) 59#endif // _MSC_VER 60 61#endif // GSL_ALGORITHM_H 62