My current plan is to read through Stroustrup's A Tour of C++, then start working on my project. When I encounter issues I'll look the topic up in Stroustrup's The C++ Programming Language.
I'm hoping someone with relevant experience can tell me if this is a decent plan, and if there's a better or faster way to learn enough C++ to write a small program that calls such a library.
[1]: https://github.com/mapnik/mapnik