extracted BigO and GetBigO in own file

include/benchmark/benchmark_api.h

@@ -154,6 +154,7 @@ BENCHMARK(BM_test)->Unit(benchmark::kMillisecond);
 #include <stdint.h>
 
 #include "macros.h"
+#include "complexity.h"
 
 namespace benchmark {
 class BenchmarkReporter;
@@ -231,20 +232,6 @@ enum TimeUnit {
   kMillisecond
 };
 
-// BigO is passed to a benchmark in order to specify the asymptotic computational 
-// complexity for the benchmark. In case oAuto is selected, complexity will be 
-// calculated automatically to the best fit.
-enum BigO {
-	oNone,
-	o1,
-	oN,
-	oNSquared,
-	oNCubed,
-	oLogN,
-	oNLogN,
-	oAuto
-};
-
 // State is passed to a running Benchmark and contains state for the
 // benchmark to use.
 class State {

include/benchmark/complexity.h

+#ifndef COMPLEXITY_H_
+#define COMPLEXITY_H_
+
+#include <string>
+
+namespace benchmark {
+
+// BigO is passed to a benchmark in order to specify the asymptotic computational 
+// complexity for the benchmark. In case oAuto is selected, complexity will be 
+// calculated automatically to the best fit.
+enum BigO {
+	oNone,
+	o1,
+	oN,
+	oNSquared,
+	oNCubed,
+	oLogN,
+	oNLogN,
+	oAuto
+};
+
+inline std::string GetBigO(BigO complexity) {
+  switch (complexity) {
+    case oN:
+      return "* N";
+    case oNSquared:
+      return "* N**2";
+    case oNCubed:
+      return "* N**3";
+    case oLogN:
+      return "* lgN";
+    case oNLogN:
+      return "* NlgN";
+    case o1:
+      return "* 1";
+    default:
+      return "";      
+  }
+}
+   
+} // end namespace benchmark
+#endif // COMPLEXITY_H_
\ No newline at end of file

include/benchmark/reporter.h

@@ -108,7 +108,6 @@ protected:
   static void ComputeStats(const std::vector<Run> & reports, Run* mean, Run* stddev);
   static void ComputeBigO(const std::vector<Run> & reports, Run* bigO, Run* rms);
   static TimeUnitMultiplier GetTimeUnitAndMultiplier(TimeUnit unit);
-  static std::string GetBigO(BigO complexity);
 };
 
 // Simple reporter that outputs benchmark data to the console. This is the

src/reporter.cc

@@ -128,25 +128,6 @@ void BenchmarkReporter::ComputeBigO(
   rms->complexity = result_cpu.complexity;
 }
 
-std::string BenchmarkReporter::GetBigO(BigO complexity) {
-  switch (complexity) {
-    case oN:
-      return "* N";
-    case oNSquared:
-      return "* N**2";
-    case oNCubed:
-      return "* N**3";
-    case oLogN:
-      return "* lgN";
-    case oNLogN:
-      return "* NlgN";
-    case o1:
-      return "* 1";
-    default:
-      return "";      
-  }
-}
-
 TimeUnitMultiplier BenchmarkReporter::GetTimeUnitAndMultiplier(TimeUnit unit) {
   switch (unit) {
     case kMillisecond: