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72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
//===--- chrono_utils.h - Utility functions for duration ------ -*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2022 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Specifically, we want ceil() for these types, but that's only available in
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// C++17, and we need to build with C++14, so... include a version of the
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// necesary code here.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_THREADING_IMPL_CHRONO_UTILS_H
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#define SWIFT_THREADING_IMPL_CHRONO_UTILS_H
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#include <chrono>
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#include <type_traits>
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namespace swift {
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namespace threading_impl {
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namespace chrono_utils {
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#if __cplusplus >= 201703L
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using std::chrono::ceil;
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#else
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namespace detail {
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template <class _Tp>
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struct is_duration : std::false_type {};
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template <class _Rep, class _Period>
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struct is_duration<std::chrono::duration<_Rep, _Period> >
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: std::true_type {};
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template <class _Rep, class _Period>
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struct is_duration<const std::chrono::duration<_Rep, _Period> >
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: std::true_type {};
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template <class _Rep, class _Period>
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struct is_duration<volatile std::chrono::duration<_Rep, _Period> >
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: std::true_type {};
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template <class _Rep, class _Period>
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struct is_duration<const volatile std::chrono::duration<_Rep, _Period> >
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: std::true_type {};
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}
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template <class To, class Rep, class Period,
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class = std::enable_if_t<detail::is_duration<To>::value>>
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constexpr To
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ceil(const std::chrono::duration<Rep, Period>& d)
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{
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To t = std::chrono::duration_cast<To>(d);
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if (t < d)
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t = t + To{1};
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return t;
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}
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#endif
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} // namespace chrono_utils
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} // namespace threading_impl
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} // namespace swift
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#endif // SWIFT_THREADING_IMPL_CHRONO_UTILS_H
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