Method add

gecode/kernel/core.hpp:3853–3858

    nl = Support::marked(nl) ? Support::mark(n) : n;
  }
  forceinline NGL*
  NGL::add(NGL* n, bool l) {
    nl = Support::marked(nl) ? Support::mark(n) : n;
    n->leaf(l);
    return n;
  }

  forceinline
  NGL::NGL(void)