...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::property_tree::translator_between — Specialize this struct to specify a default translator between the data in a tree whose data_type is Internal, and the external data_type specified in a get_value, get, put_value or put operation. This is already specialized for Internal being std::basic_string.
// In header: <boost/property_tree/ptree_fwd.hpp> template<typename Internal, typename External> struct translator_between { };