ResultsCheckerEntry: add more getter functions.

test/output_test.h

@@ -73,9 +73,26 @@ struct ResultsCheckerEntry {
   std::map< std::string, std::string > values;
   ResultsCheckFn check_fn;
 
-  // int NumThreads() const; // TODO
-  // double duration_real_time() const {} // TODO
-  // double duration_cpu_time() const {} // TODO
+  int NumThreads() const {
+    auto pos = name.find_last_of("/threads:");
+    if(pos == name.npos) return 1;
+    auto end = name.find_last_of('/', pos + 9);
+    std::stringstream ss;
+    ss << name.substr(pos + 9, end);
+    int num = 1;
+    ss >> num;
+    CHECK(!ss.fail());
+    return num;
+  }
+
+  // get the real_time duration of the benchmark in seconds
+  double DurationRealTime() const {
+    return GetAs< double >("iterations") * GetTime("real_time");
+  }
+  // get the cpu_time duration of the benchmark in seconds
+  double DurationCPUTime() const {
+    return GetAs< double >("iterations") * GetTime("cpu_time");
+  }
 
   // get the string for a result by name, or nullptr if the name
   // is not found
@@ -105,6 +122,25 @@ struct ResultsCheckerEntry {
     T tval = static_cast< T >(dval);
     return tval;
   }
+
+  // get cpu_time or real_time in seconds
+  double GetTime(const char* which) const {
+    double val = GetAs< double >(which);
+    auto unit = Get("time_unit");
+    CHECK(unit);
+    if(*unit == "ns") {
+      return val * 1.e-9;
+    } else if(*unit == "us") {
+      return val * 1.e-6;
+    } else if(*unit == "ms") {
+      return val * 1.e-3;
+    } else if(*unit == "s") {
+      return val;
+    } else {
+      CHECK(1 == 0) << "unknown time unit: " << *unit;
+      return 0;
+    }
+  }
 };
 
 #define _CHECK_RESULT_VALUE(entry, getfn, var_type, var_name, relationship, value) \