two-liner for measuring elapsed time in C++11

timing.cpp

#include <chrono>
std::chrono::high_resolution_clock::time_point t_start = std::chrono::high_resolution_clock::now();
//...
float elapsedTime = std::chrono::duration_cast<std::chrono::duration<float>>(std::chrono::high_resolution_clock::now() - t_start).count();