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- unary_ufunc
- ===========
- .. contents :: Table of Contents
- A ``unary_ufunc`` is a struct used as an intermediate step to broadcast a single argument so that a C++ function can be converted to a ufunc like function
- ``<boost/python/numpy/ufunc.hpp>`` contains the ``unary_ufunc`` structure definitions
- synopsis
- --------
- ::
- namespace boost
- {
- namespace python
- {
- namespace numpy
- {
- template <typename TUnaryFunctor,
- typename TArgument=typename TUnaryFunctor::argument_type,
- typename TResult=typename TUnaryFunctor::result_type>
- struct unary_ufunc
- {
- static object call(TUnaryFunctor & self,
- object const & input,
- object const & output) ;
- static object make();
- };
- }
- }
- }
- constructors
- ------------
- ::
- struct example_unary_ufunc
- {
- typedef any_valid_type argument_type;
- typedef any_valid_type result_type;
- };
- :Requirements: The ``any_valid`` type must be defined using typedef as a valid C++ type in order to use the struct methods correctly
- :Note: The struct must be exposed as a Python class, and an instance of the class must be created to use the ``call`` method corresponding to the ``__call__`` attribute of the Python object
- accessors
- ---------
- ::
- template <typename TUnaryFunctor,
- typename TArgument=typename TUnaryFunctor::argument_type,
- typename TResult=typename TUnaryFunctor::result_type>
- static object call(TUnaryFunctor & self,
- object const & input,
- object const & output);
- :Requires: Typenames ``TUnaryFunctor`` and optionally ``TArgument`` for argument type and ``TResult`` for result type
- :Effects: Passes a Python object to the underlying C++ functor after broadcasting its arguments
- ::
- template <typename TUnaryFunctor,
- typename TArgument=typename TUnaryFunctor::argument_type,
- typename TResult=typename TUnaryFunctor::result_type>
- static object make();
- :Requires: Typenames ``TUnaryFunctor`` and optionally ``TArgument`` for argument type and ``TResult`` for result type
- :Returns: A Python function object to call the overloaded () operator in the struct (in typical usage)
- Example(s)
- ----------
- ::
- namespace p = boost::python;
- namespace np = boost::python::numpy;
- struct UnarySquare
- {
- typedef double argument_type;
- typedef double result_type;
- double operator()(double r) const { return r * r;}
- };
- p::object ud = p::class_<UnarySquare, boost::shared_ptr<UnarySquare> >("UnarySquare").def("__call__", np::unary_ufunc<UnarySquare>::make());
- p::object inst = ud();
- std::cout << "Square of unary scalar 1.0 is " << p::extract <char const * > (p::str(inst.attr("__call__")(1.0))) << std::endl ;
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