Squashed 'third_party/google-benchmark/' content from commit 785e2c3
Change-Id: Iaaca5eca89f717081452e643a233e86425b03e89
git-subtree-dir: third_party/google-benchmark
git-subtree-split: 785e2c3158589e8ef48c59ba80e48d76bdbd8902
diff --git a/src/log.h b/src/log.h
new file mode 100644
index 0000000..47d0c35
--- /dev/null
+++ b/src/log.h
@@ -0,0 +1,74 @@
+#ifndef BENCHMARK_LOG_H_
+#define BENCHMARK_LOG_H_
+
+#include <iostream>
+#include <ostream>
+
+#include "benchmark/benchmark.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
+
+// clang-format off
+#define VLOG(x) \
+ (::benchmark::internal::GetLogInstanceForLevel(x) << "-- LOG(" << x << "):" \
+ " ")
+// clang-format on
+#endif