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//===- llvm/Support/Chrono.h - Utilities for Timing Manipulation-*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CHRONO_H
#define LLVM_SUPPORT_CHRONO_H
#include "llvm/Support/Compiler.h"
#include <chrono>
#include <ctime>
namespace llvm {
class raw_ostream;
namespace sys {
/// A time point on the system clock. This is provided for two reasons:
/// - to insulate us agains subtle differences in behavoir to differences in
/// system clock precision (which is implementation-defined and differs between
/// platforms).
/// - to shorten the type name
/// The default precision is nanoseconds. If need a specific precision specify
/// it explicitly. If unsure, use the default. If you need a time point on a
/// clock other than the system_clock, use std::chrono directly.
template <typename D = std::chrono::nanoseconds>
using TimePoint = std::chrono::time_point<std::chrono::system_clock, D>;
/// Convert a TimePoint to std::time_t
LLVM_ATTRIBUTE_ALWAYS_INLINE inline std::time_t toTimeT(TimePoint<> TP) {
using namespace std::chrono;
return system_clock::to_time_t(
time_point_cast<system_clock::time_point::duration>(TP));
}
/// Convert a std::time_t to a TimePoint
LLVM_ATTRIBUTE_ALWAYS_INLINE inline TimePoint<std::chrono::seconds>
toTimePoint(std::time_t T) {
using namespace std::chrono;
return time_point_cast<seconds>(system_clock::from_time_t(T));
}
} // namespace sys
raw_ostream &operator<<(raw_ostream &OS, sys::TimePoint<> TP);
} // namespace llvm
#endif // LLVM_SUPPORT_CHRONO_H
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