1.11.10 The class PlFunctor

PlFunctor wraps functor_t, the internal representation of a name/arity pair. A functor name is a program object rather than arbitrarily encoded external data and is therefore hard-wired to UTF-8, consistent with PlModule and PlPredicate (and the PL_predicate() C API); these constructors take no PlEncoding argument.

PlFunctor :: PlFunctor(functor_t handle)

Create from a C-interface functor handle (functor_t). Used internally and for integration with the C-interface.

PlFunctor :: PlFunctor(const char *name, size_t arity)

PlFunctor :: PlFunctor(const std::string& name, size_t arity)

PlFunctor :: PlFunctor(const std::wstring& name, size_t arity)

Create a functor from name and arity. The char* and std::string name is interpreted as UTF-8. See PL_new_functor() and PL_new_atom_mbchars().

PlFunctor :: PlFunctor(PlAtom name, size_t arity)

Create a functor from an existing PlAtom and arity. See PL_new_functor().

bool is_null()

bool not_null()

Test whether the wrapped functor_t handle is null.