summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/benchmark/src/log.h
blob: e965d36194b3ef3a2fab1655293a3d43ccbe4d2c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
#ifndef BENCHMARK_LOG_H_
#define BENCHMARK_LOG_H_

#include <iostream>
#include <ostream>

#include "benchmark/macros.h"

namespace benchmark {
namespace internal {

typedef std::basic_ostream<char>&(EndLType)(std::basic_ostream<char>&);

class LogType {
  friend LogType& GetNullLogInstance();
  friend LogType& GetErrorLogInstance();

  // FIXME: Add locking to output.
  template <class Tp>
  friend LogType& operator<<(LogType&, Tp const&);
  friend LogType& operator<<(LogType&, EndLType*);

 private:
  LogType(std::ostream* out) : out_(out) {}
  std::ostream* out_;
  BENCHMARK_DISALLOW_COPY_AND_ASSIGN(LogType);
};

template <class Tp>
LogType& operator<<(LogType& log, Tp const& value) {
  if (log.out_) {
    *log.out_ << value;
  }
  return log;
}

inline LogType& operator<<(LogType& log, EndLType* m) {
  if (log.out_) {
    *log.out_ << m;
  }
  return log;
}

inline int& LogLevel() {
  static int log_level = 0;
  return log_level;
}

inline LogType& GetNullLogInstance() {
  static LogType log(nullptr);
  return log;
}

inline LogType& GetErrorLogInstance() {
  static LogType log(&std::clog);
  return log;
}

inline LogType& GetLogInstanceForLevel(int level) {
  if (level <= LogLevel()) {
    return GetErrorLogInstance();
  }
  return GetNullLogInstance();
}

} // end namespace internal
} // end namespace benchmark

#define VLOG(x) (::benchmark::internal::GetLogInstanceForLevel(x) \
                 << "-- LOG(" << x << "): ")

#endif