on the speed of std::string::find

[Paolo Carlini]

Paolo Carlini wrote:

> Dennis, thanks for your help, but something is certainly wrong in the 
> benchmarking, we can't trust it. Likely, it's because of the 
> optimization level, or something else. As I said already, you must use 
> -O2, otherwise we are measuring something which nobody will see in 
> practice.

Just to say one, without inlining at -O0, going through type_traits (the 
tiny eq, in particular) means function calls which are certainly heavy 
to do for each char. This thing alone makes the "new" implementation 
appear much slower than memmem where the algorithm is in fact the same.

Paolo.