static struct timeval tmpv1;
static struct timeval tmpv2;
-static string mem1;
-static string mem2;
+static std::string mem1;
+static std::string mem2;
-static void read_procmem(string& memstr) {
+static void read_procmem(std::string& memstr) {
std::string buf;
pid_t pid = getpid();
std::stringstream path;