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Wrappers |
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Suppose you have this function:
std::vector<std::string> names();
But you don't want to to export std::vector<std::string>, you want this function to return a python list of strings. Boost.Python has excellent support for things like that:
list names_wrapper()
{
list result;
// call original function
vector<string> v = names();
// put all the strings inside the python list
vector<string>::iterator it;
for (it = v.begin(); it != v.end(); ++it){
result.append(*it);
}
return result;
}
BOOST_PYTHON_MODULE(test)
{
def("names", &names_wrapper);
}
Nice heh? Pyste supports this mechanism too. You declare the names_wrapper function in a header named "test_wrappers.h" and in the interface file:
Include("test_wrappers.h")
names = Function("names", "test.h")
set_wrapper(names, "names_wrapper")
You can optionally declare the function in the interface file itself:
names_wrapper = Wrapper("names_wrapper",
"""
list names_wrapper()
{
// code to call name() and convert the vector to a list...
}
""")
names = Function("names", "test.h")
set_wrapper(names, names_wrapper)
The same mechanism can be used with member functions too. Just remember that the first parameter of wrappers for member functions is a pointer to the class, as in:
struct C
{
std::vector<std::string> names();
}
list names_wrapper(C* c)
{
// same as before, calling c->names() and converting result to a list
}
And then in the interface file:
C = Class("C", "test.h")
set_wrapper(C.names, "names_wrapper")
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Copyright © 2003 Bruno da Silva de Oliveira
Copyright © 2002-2003 Joel de Guzman
Permission to copy, use, modify, sell and distribute this document
is granted provided this copyright notice appears in all copies. This document
is provided "as is" without express or implied warranty, and with
no claim as to its suitability for any purpose.