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- [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]
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