[section boost/python/long.hpp]

[section Introduction]

Exposes a [link concepts.objectwrapper.typewrapper_concept_requirements TypeWrapper] for the Python [@http://www.python.org/doc/current/lib/typesnumeric.html long] integer type.

[endsect]

[section Class `long_`]

Exposes the [@http://www.python.org/doc/current/lib/typesnumeric.html numeric type protocol] of Python's built-in `long` type. The semantics of the constructors and member functions defined below can be fully understood by reading the [link concepts.objectwrapper.typewrapper_concept_requirements TypeWrapper] concept definition. Since `long_` is publicly derived from [link object_wrappers.boost_python_object_hpp.class_object `object`], the public `object` interface applies to `long_` instances as well.

``

namespace boost { namespace python

{

class long_ : public object

{

public:

long_(); // new long_

template <class T>

explicit long_(T const& rhs);

template <class T, class U>

long_(T const& rhs, U const& base);

};

}}

``

[endsect]

[section Example]

``

namespace python = boost::python;

// compute a factorial without overflowing

python::long_ fact(long n)

{

if (n == 0)

return python::long_(1);

else

return n * fact(n - 1);

}

``

[endsect]

[endsect]