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