Profiling graph library

[bearophile]

Joseph Rushton Wakeling:

> But most likely the best compromise solution is as you
> suggest a buffer, with the instruction ".dup the result
> if you want it to be persistent".

In my library code often I do the opposite: I add a template 
boolean switch named as "doCopy" that defaults to true. If it's 
true, the function copies the buffer. So if you don't know what 
you are doing, or you don't care about performance (and this 
happens often), it's safer. When you know what you are doing or 
your profiling (or your experience) tells you you want more 
performance, you call the function with a false doCopy, and it 
doesn't allocate a new buffer.

This is the design I suggested for File.byLine() but Andrei ha 
preferred a simpler design that doesn't create a new buffer for 
each line.

Bye,
bearophile