Can't understand why I'm not being allowed to subscript this vector

Question

The code I'm trying to run:

std::string genBlankName(std::vector<Post> &posts)
{
    std::string baseName = "New Post ";
    int postNum = 1;

    for (std::vector<Post>::iterator currentPost = posts.begin(); currentPost != posts.end(); currentPost++)
    {
        if (posts[currentPost].name.substr(0, baseName.length()) == baseName &&
            utils::is_num(posts[currentPost].name.substr(baseName.length(), std::string::npos)) &&
            utils::to_int(posts[currentPost].name.substr(baseName.length(), std::string::npos)) > postNum)
        {
            postNum = utils::to_int(posts[currentPost].name.substr(baseName.length(), std::string::npos));
        }
    }

    return baseName + utils::to_string(postNum);
}

And the error I get:

/home/brett/projects/CLPoster/CLPoster-build-desktop/../CLPoster/item.h:240: error: no matching function for call to std::vector<cl::Post, std::allocator<cl::Post> >::at(__gnu_cxx::__normal_iterator<cl::Post*, std::vector<cl::Post, std::allocator<cl::Post> > >&)

Sorry for not saying more, but I'm assuming this is a pretty common thing I'm just unaware of being a nub. I'd google it, but it seems too general of a problem to turn up anything useful as I suspect it's more of a problem with my implementation or something along those lines.

Answer 1

Subscripting requires the use of an index, you’re using iterators.

You don’t need subscript at all, just dereference your iterator:

currentPost->name.substr(0, baseName.length())

… and so on.