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

Trevor Blackwell tlb at anybots.com
Fri May 28 20:01:22 CEST 2004

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;

        .def_readwrite("buz", &bar_t::buz);
        .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

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