On 2014-10-03 12:56, MM wrote:
> yes i did that.
>
> class C {
> public:
> const std::string& get_name() const;
> void set_name(const std::string&);
> private:
> std::string name_;
> };
>
>
>
> class_<C>("C").
> .add_property("name", &C::get_name, &C::set_name);
>
>
> this fails to compile because of unspecified call policies about the
> string refs.
>
>
> The following, on the other hand, compiles.
>
> class C {
> public:
> const std::string get_name() const;
> void set_name(const std::string);
> ....
> class_<C>("C").
> .add_property("name", &C::get_name, &C::set_name);
>
>
> Which policy do I specify? and how do I set it in add_property?
Good question. The policy you want is likely pass-by-value (In Python
strings are immutable anyhow), however I have no idea how to express
that with the add_property() call.
As a quick hack I suggest adding a wrapper function that returns the
result by-value:
std::string get_name(C &c) { return c.get_name();}
and use that. That's neither elegant nor efficient (if you call it a
lot), but it may unblock you until you find a real fix.
Stefan
--
...ich hab' noch einen Koffer in Berlin...
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