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Library/boost/libs/python/doc/reference/copy_const_reference.qbk
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PatoFlamejanteTV
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19 дек 2024, 19:11
19 дек 2024, 19:11
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[section boost/python/copy_const_reference.hpp] [section Class `copy_const_reference`] `copy_const_reference` is a model of [link concepts.resultconverter.resultconvertergenerator_concept ResultConverterGenerator] which can be used to wrap C++ functions returning a reference-to-const type such that the referenced value is copied into a new Python object. `` namespace boost { namespace python { struct copy_const_reference { template <class T> struct apply; }; }} `` [endsect] [section Class `copy_const_reference` metafunctions] ``template <class T> struct apply`` [variablelist [[Requires][`T` is `U const&` for some `U`.]] [[Returns][`typedef to_python_value<T> type;`]] ] [endsect] [section Example] C++ module definition: `` #include <boost/python/module.hpp> #include <boost/python/class.hpp> #include <boost/python/copy_const_reference.hpp> #include <boost/python/return_value_policy.hpp> // classes to wrap struct Bar { int x; } struct Foo { Foo(int x) : { b.x = x; } Bar const& get_bar() const { return b; } private: Bar b; }; // Wrapper code using namespace boost::python; BOOST_PYTHON_MODULE(my_module) { class_<Bar>("Bar"); class_<Foo>("Foo", init<int>()) .def("get_bar", &Foo::get_bar , return_value_policy<copy_const_reference>()) ; } `` Python code: `` >>> from my_module import * >>> f = Foo(3) # create a Foo object >>> b = f.get_bar() # make a copy of the internal Bar object `` [endsect] [endsect]