Make StatsMinimal.h directly compatible with C

Author: Henry Qin

cwrapper/perf_wrapper_test.c

@@ -29,9 +29,14 @@ void fiveHundredCycles() {
     fixedCycles(500);
 }
 
+uint64_t half(uint64_t n) {
+    return n / 2;
+}
+
 int
 main() {
     Statistics stats = bench(fiveHundredCycles, 100000);
+    stats = transformStatistics(stats, half);
     if (stats.count == 100000 && stats.count > stats.min) {
         puts(GREEN("perf_wrapper_test PASSED"));
     } else {

src/StatsMinimal.h

@@ -19,6 +19,10 @@
 #include <stddef.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * This file exists to make the computeStatistics function available from C
  * without an extra wrapper around the stats component of PerfUtils.
@@ -59,4 +63,8 @@ struct Statistics transformStatistics(struct Statistics stats, uint64_t (*functi
  */
 void printStatistics(struct Statistics stats, const char* label);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // PERFUTILS_STATS_MINIMAL_H