------- Comment #6 from pcarlini at suse dot de 2006-09-12 20:18 ------- (In reply to comment #5) > Why would this be faster ?
Just try... > The resize() happend only once at the beginning, before the iteration starts. > And even with the reserve(), the reserve() would happen everytime before the > inner loop (which iterates over the vector), and then the memory allocations > would happen ? "problematic" are string assigns, not += and you are moving the reserve *after* the assign. The reason of that is simply that string assigns try to exploit reference counting to reduce the amount of deep copies. But, again, just try or look at the sources. Trust me, being the maintainer of the string class, these are basic things. > What's the exact difference between reserve() and resize() ? Likewise, just look at the sources (we are on free software projects, right? ;) or study the standard or the manuals around. Resize to a bigger size basically is the same as reserve + a fill of default-constructed chars on the tail. You don't need the last part, right? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29037
