39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
[section boost/python/long.hpp]
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[section Introduction]
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Exposes a [link concepts.objectwrapper.typewrapper_concept_requirements TypeWrapper] for the Python [@http://www.python.org/doc/current/lib/typesnumeric.html long] integer type.
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[endsect]
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[section Class `long_`]
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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.
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``
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namespace boost { namespace python
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{
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class long_ : public object
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{
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public:
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long_(); // new long_
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template <class T>
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explicit long_(T const& rhs);
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template <class T, class U>
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long_(T const& rhs, U const& base);
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};
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}}
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``
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[endsect]
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[section Example]
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``
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namespace python = boost::python;
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// compute a factorial without overflowing
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python::long_ fact(long n)
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{
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if (n == 0)
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return python::long_(1);
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else
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return n * fact(n - 1);
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}
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``
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[endsect]
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[endsect]
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