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5802a362f8
Pragma once is the more modern version of include guards, eliminating any potential problems with mistyping include guards. Let's use those.
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
//
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// Copyright 2018 Ettus Research, a National Instruments Company
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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// This narrowing code is inspired by the guidelines support library by
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// Microsoft: https://github.com/Microsoft/GSL/
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//
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// The C++ guidelines are published here:
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// https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md
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//
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// There are some minor details between this implementation and the Microsoft
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// implementation, but they are similar (the main difference is the exception
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// type thrown).
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// The original code was published under the following license:
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//
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///////////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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// [End of GSL license]
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#include <uhd/exception.hpp>
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#include <utility>
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable : 4127) // conditional expression is constant
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#endif // _MSC_VER
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namespace uhd {
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/*! Static typecast which expresses intent of narrowing
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*
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* Use this for any conversion that narrows, e.g.:
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*
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* \code{.cpp}
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* uint16_t x = peek16();
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* uint8_t y = narrow_cast<uint8_t>(x);
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* \endcode
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*/
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template <class T, class U>
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inline constexpr T narrow_cast(U&& u) noexcept
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{
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return static_cast<T>(std::forward<U>(u));
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}
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/*! Like narrow_cast, but will throw an exception on failure.
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*
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* Call this if you're not sure if the cast will work as expected (e.g. when
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* narrowing user input).
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*
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* \throws uhd::narrowing_error on failure
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*/
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template <class T, class U>
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inline T narrow(U u)
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{
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T t = narrow_cast<T>(u);
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if (static_cast<U>(t) != u) {
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throw narrowing_error("");
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}
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if (!std::integral_constant<bool,
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std::is_signed<T>::value == std::is_signed<U>::value>::value
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&& ((t < T{}) != (u < U{}))) {
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throw narrowing_error("");
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}
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return t;
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}
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} /* namespace uhd */
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#if defined(_MSC_VER)
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# pragma warning(pop)
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#endif // _MSC_VER
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