6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
//===-- Timeout.h -----------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_UTILITY_TIMEOUT_H
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#define LLDB_UTILITY_TIMEOUT_H
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#include "llvm/Support/Chrono.h"
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#include "llvm/Support/FormatProviders.h"
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#include <optional>
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namespace lldb_private {
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// A general purpose class for representing timeouts for various APIs. It's
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// basically an std::optional<std::chrono::duration<int64_t, Ratio>>, but we
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// customize it a bit to enable the standard chrono implicit conversions (e.g.
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// from Timeout<std::milli> to Timeout<std::micro>.
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//
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// The intended meaning of the values is:
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// - std::nullopt - no timeout, the call should wait forever - 0 - poll, only
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// complete the call if it will not block - >0 - wait for a given number of
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// units for the result
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template <typename Ratio>
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class Timeout : public std::optional<std::chrono::duration<int64_t, Ratio>> {
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private:
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template <typename Ratio2> using Dur = std::chrono::duration<int64_t, Ratio2>;
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template <typename Rep2, typename Ratio2>
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using EnableIf = std::enable_if<
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std::is_convertible<std::chrono::duration<Rep2, Ratio2>,
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std::chrono::duration<int64_t, Ratio>>::value>;
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using Base = std::optional<Dur<Ratio>>;
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public:
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Timeout(std::nullopt_t none) : Base(none) {}
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template <typename Ratio2,
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typename = typename EnableIf<int64_t, Ratio2>::type>
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Timeout(const Timeout<Ratio2> &other)
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: Base(other ? Base(Dur<Ratio>(*other)) : std::nullopt) {}
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template <typename Rep2, typename Ratio2,
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typename = typename EnableIf<Rep2, Ratio2>::type>
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Timeout(const std::chrono::duration<Rep2, Ratio2> &other)
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: Base(Dur<Ratio>(other)) {}
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};
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} // namespace lldb_private
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namespace llvm {
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template<typename Ratio>
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struct format_provider<lldb_private::Timeout<Ratio>, void> {
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static void format(const lldb_private::Timeout<Ratio> &timeout,
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raw_ostream &OS, StringRef Options) {
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typedef typename lldb_private::Timeout<Ratio>::value_type Dur;
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if (!timeout)
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OS << "<infinite>";
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else
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format_provider<Dur>::format(*timeout, OS, Options);
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}
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};
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}
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#endif // LLDB_UTILITY_TIMEOUT_H
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