Already asked this question and received answers about c++ STL but what about boost?
This is a question about boost Finders. If you have a link to describable boost library implementations I would appreciate it to make hunting the boost library for practical applications easier.
My question is which boost finder most applies to lastIndexOf?
Well first off, the simplest option if you're going to search for the last occurrence of a substring is to use std::string::rfind:
std::string str = "Hello, World!";
int index = str.rfind("o");
If you need to use Boost because you want it to work on generic ranges, use boost::algorithm::find_last. It takes two ranges. The second range is searched for in the first range.
std::string str = "Hello, World!";
iterator_range<std::string::iterator> it = find_last(str, "o");
int index = std::distance(str.begin(), it.begin());
If you really want to user a finder, it seems like you're looking for boost::algorithm::last_finder. The finders return a function object that takes two iterators as its arguments. The function returns an iterator_range You can use it like so:
auto finder = last_finder("o");
std::string str = "Hello, World!";
iterator_range<std::string::iterator> it = finder(str.begin(), str.end());
int index = std::distance(str.begin(), it.begin());