On 03/15/2012 09:22 AM, christophe jean-joseph wrote:
Hello
The situation is as follow.
I have a C++ code that I haven't written and that I barely can modified.
I am supposed to reflect this code in Python with boost.
In the code, I have something looking like this:
Class A_Base {
A_Base(){};
~A_Base(){};
Whatever virtual and pure virtual functions;
}
Class A_Derived{
A_Derived(Type1 arg1,...){whatever instructions;}
~A_Derived(){};
Whatever functions;
}
Class B {
B(A_Base& aBase, double& x){};
~B(){};
Whatever functions;
}
In the C++ main, at some point aDerived A_Derived is set, and then
B(aDerived, x).
I need to reflect that under python.
Until now, I have been able, with a simple example, to reflect a
function f, which is not a ctor, from a class B using A_Base& as
argument type, but I can't figure out how to deal with it for a constructor.
Based on:
http://wiki.python.org/moin/boost.python/ExportingClasses
I am declaring f under both its class B and A_Base as follow:
class_A_Base <A, boost::noncopyable>("A_Base", no_init) //this line can
be modified
.def("f", &B::f);
class_B <B, boost::noncopyable>("B", init< >()) //this line can be modified
.def("f", &B::f);
But when I try this for a constructor as f, it refuse to compile.
You don't wrap constructors the same way as functions (I don't think you
can even take their address in C++). Instead, you use:
.def(init<T1,T2,...>())
(where T1,T2,... are the argument types of the constructor), or do the
same thing in the init argument to class_ itself (as I've done below).
I think what you want is something like this (assuming A_Derived does
actually inherit from A_Base, even though it doesn't in your example code):
class_<A_Base,noncopyable>("A_Base", no_init);
class_<A_Derived,bases<A_Base>,noncopyable>("A_Derived", no_init);
class_<B,noncopyable>("B", init<A,double>());
Note that the float you pass in as "x" to B's constructor will not be
modified in Python; that's unavoidable in this case.
If that doesn't work, please post exactly what you're trying to compile;
the example you posted has a few things that obviously won't compile, so
it's hard to know exactly what the problem is.
Good luck!
Jim
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