[Cleanup] Use std::flush

src/one-body-sample.cc

@@ -488,7 +488,7 @@ int main(int argc, char *argv[]) {
         parset.get<Solver::VerbosityMode>("v.solver.verbosity");
     for (size_t run = 1; run <= timesteps; ++run) {
       if (printProgress)
-        (std::cout << boost::format("%7d ") % run << " ").flush();
+        std::cout << boost::format("%7d ") % run << " " << std::flush;
 
       stateUpdater->nextTimeStep();
       timeSteppingScheme->nextTimeStep();
@@ -560,7 +560,7 @@ int main(int argc, char *argv[]) {
 
         iterationWriter << iterationCounter << " ";
         if (printProgress)
-          (std::cout << '.').flush();
+          std::cout << '.' << std::flush;
 
         if (stateFPI > 1) {
           double const velocityCorrection = AMNorm.diff(u_saved, u);