[C++-sig] Return by value/pointer and properties

[Trevor Blackwell]

I wish I understood better how boost.python wraps return values of
accessors created with def_readwrite or add_property. In neither case is
there any place to specify a return_value_policy.

I see empirically that if I define:

struct bar_t {
  int buz;
};

struct foo_t {
  bar_t bar;
};

    class_<bar_t>("bar_t")
        .def_readwrite("buz", &bar_t::buz);
    class_<foo_t>("foo_t")
        .def_readwrite("bar", &foo_t::bar);

then calling foo.bar returns by pointer. (So, for instance,
foo.bar.buz=3; print foo.bar.buz; prints 3). But is it a
custodian_and_ward, or what? What if I wanted it to wrap by value? I can
do it by using add_property and a getter method that returns by value,
but that's kind of cumbersome.

-- 
Trevor Blackwell      tlb at anybots.com       (650) 210-9272