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c++pointersiteratorreverse

Standard way for reverse pointer iterators

Is there something like rbegin and rend for pointers?

I have pointers to the head and tail of a c-style string but would like to create reverse iterators for them.

I want to know if there is a way to do this that is supplied by the standard, or if I have to write my own code for this.

EDIT: I am using low level code for a reason. No std::basic_string and such. Goal is to use std::find to find last occurrence of a value.

Solution

  • Use std::reverse_iterator:

    #include <iostream>
#include <iterator>

int main() {
    const char* s = "abc";
    std::reverse_iterator<const char*> first(s + 3);
    std::reverse_iterator<const char*> last(s);
    for( ; first != last; ++first) {
        std::cout << *first;
    }
    std::cout << '\n';
    return 0;
}