There isn't much more to improve after the code has begun to accept function parameters.

These are some details, you could freely ignore them:

• Class names should begin with an uppercase letter

  struct Measure

• You don't need the duration variable; just do:
  return std::chrono::duration_cast< TimeT>(std::chrono::system_clock::now() - start).count();

There isn't much more to improve after the code has begun to accept function parameters.

These are some details, you could freely ignore them:

• Class names should begin with an uppercase letter

   struct Measure
  

• You don't need the duration variable; just do:

   return std::chrono::duration_cast< TimeT>(std::chrono::system_clock::now() - start).count();