ceph/src/boost/libs/python/doc/reference/long.qbk

   1 [section boost/python/long.hpp]
   2 [section Introduction]
   3 Exposes a [link concepts.objectwrapper.typewrapper_concept_requirements TypeWrapper] for the Python [@http://www.python.org/doc/current/lib/typesnumeric.html long] integer type.
   4 [endsect]
   5 [section Class `long_`]
   6 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.
   7 ``
   8 namespace boost { namespace python
   9 {
  10   class long_ : public object
  11   {
  12    public:
  13       long_(); // new long_
  14
  15       template <class T>
  16       explicit long_(T const& rhs);
  17
  18       template <class T, class U>
  19       long_(T const& rhs, U const& base);
  20   };
  21 }}
  22 ``
  23 [endsect]
  24 [section Example]
  25 ``
  26 namespace python = boost::python;
  27
  28 // compute a factorial without overflowing
  29 python::long_ fact(long n)
  30 {
  31    if (n == 0)
  32       return python::long_(1);
  33    else
  34       return n * fact(n - 1);
  35 }
  36 ``
  37 [endsect]
  38 [endsect]