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Boost.PythonHeader <boost/python/implicit.hpp> |
implicitly_convertibleimplicitly_convertible allows Boost.Python to implicitly
take advantage of a C++ implicit or explicit conversion when matching
Python objects to C++ argument types.
implicitly_convertibletemplate <class Source, class Target> void implicitly_convertible();
| Parameter | Description |
|---|---|
Source |
The source type of the implicit conversion |
Target |
The target type of the implicit conversion |
Target t(s);, where
s is of type Source, is valid.from_python
converter to Target which can succeed for any
PyObject* p iff there exists any registered converter
which can produce Source rvalues
#include <boost/python/class.hpp>
#include <boost/python/implicit.hpp>
#include <boost/python/module.hpp>
using namespace boost::python;
struct X
{
X(int x) : v(x) {}
operator int() { return v; }
int v;
};
int x_value(X const& x)
{
return x.v;
}
X make_x(int n) { return X(n); }
BOOST_PYTHON_MODULE(implicit_ext)
{
def("x_value", x_value);
def("make_x", make_x);
class_<X>("X",
init<int>())
;
implicitly_convertible<X,int>();
implicitly_convertible<int,X>();
}
>>> from implicit_ext import * >>> x_value(X(42)) 42 >>> x_value(42) 42 >>> x = make_x(X(42)) >>> x_value(x) 42
Revised 13 November, 2002
© Copyright Dave Abrahams 2002.