Hi,
We have a simple data structure like this, that we would like to expose via
boost python:
struct Layer
{
double value;
};
struct Document
{
std::vector< Layer > layer;
};
If we were writing this in pure python, then it could be written as follows:
class Layer:
def __init__( self ):
self.value = 0.0
class Document:
def __init__( self ):
self.layers = []
We would like our C++ bindings to match the behaviour of python as closely as
possible. But we have encountered a scenario in which it doesn't, and we wanted
to get some advice on the best way forward.
In pure python, the following code produces an output of '123.0':
l = Layer( )
d = Document( )
d.layers.append( l )
l.value = 123.0
print d.layers[0].value
When exposing C++ classes via boost python (using the vector_indexing_suite for
Document.layers), it produces a result of '0.0'.
The 'append' is making a copy such that 'l' and 'd.layers[0]' are two separate
objects. We've noticed that one way to make this work is by using shared_ptr in
our C++ data structure, but we feel we would have to compromise on our C++ API
as a result. Do we have any other options?
Thanks,
James.
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