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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] |