4.1 Constructors

PlTerm :: PlTerm()

Creates a new initialised term (holding a Prolog variable).

PlTerm :: PlTerm(term_t t)

Converts between the C-interface and the C++ interface by turning the term-reference into an instance of PlTerm. Note that, being a lightweight class, this is a no-op at the machine-level!

PlTerm :: PlTerm(const char *text)

Creates a term-references holding a Prolog atom representing text.

PlTerm :: PlTerm(const PlAtom &atom)

Creates a term-references holding a Prolog atom from an atom-handle.

PlTerm :: PlTerm(long n)

Creates a term-references holding a Prolog integer representing n.

PlTerm :: PlTerm(double f)

Creates a term-references holding a Prolog float representing f.

PlTerm :: PlTerm(void *ptr)

Creates a term-references holding a Prolog pointer. A pointer is represented in Prolog as a mangled integer. The mangling is designed to make most pointers fit into a tagged-integer. Any valid pointer can be represented. This mechanism can be used to represent pointers to C++ objects in Prolog. Please note that `myclass' should define conversion to and from void *.

PREDICATE(make_my_object, 1)
{ myclass *myobj = new myclass();

  return A1 = (void *)myobj;
}

PREDICATE(free_my_object, 1)
{ myclass *myobj = (void *)A1;

  delete(myobj);
  return TRUE;
}