on the speed of std::string::find

[Paolo Carlini]

Dennis Lubert wrote:

>Hello,
>
>I recently did some profiling of my application (compiled with gcc 4.1)
>using callgrind (part of valgrind). I found out that the good old
>std::strstr is between 4 and 20 times faster than std::string::find.
>
First, which version of gcc are you using? Recent versions simply 
delegate to the std::search in <algorithm>, which was benchmarked to be 
much faster than an algorithm based on char_traits::find, thus memchr, 
basically. Of course we are talking here about the overload of 
string::find exactly corresponding to strstr (that is, search a whole 
string inside another one), because the other, "simpler", overloads, all 
delegate already to memchr (via char_traits::memchr).

Paolo.