SPL &reftitle.intro; SPL is a collection of interfaces and classes that are meant to solve standard problems. Legacy "doxygen" documentation can be found here. &reference.spl.setup; &reference.spl.constants; &reference.spl.datastructures; &reference.spl.iterators; &reference.spl.interfaces; &reference.spl.exceptions; &reference.spl.reference; &reference.spl.files; &reference.spl.miscellaneous;