ssize len = find.length ();
ssize replen = replace.length ();
for (ssize i = str->find (find); i != NPOS; i = str->find (find, i + replen))
ssize len = find.length ();
ssize replen = replace.length ();
for (ssize i = str->find (find); i != NPOS; i = str->find (find, i + replen))