// Copyright Jim Bosch 2010-2012.
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// Copyright Stefan Seefeld 2016.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef boost_python_numpy_invoke_matching_hpp_
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#define boost_python_numpy_invoke_matching_hpp_
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/**
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* @brief Template invocation based on dtype matching.
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*/
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#include <boost/python/numpy/dtype.hpp>
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#include <boost/python/numpy/ndarray.hpp>
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#include <boost/mpl/integral_c.hpp>
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namespace boost { namespace python { namespace numpy {
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namespace detail
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{
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struct BOOST_NUMPY_DECL add_pointer_meta
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{
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template <typename T>
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struct apply
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{
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typedef typename boost::add_pointer<T>::type type;
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};
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};
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struct BOOST_NUMPY_DECL dtype_template_match_found {};
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struct BOOST_NUMPY_DECL nd_template_match_found {};
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template <typename Function>
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struct dtype_template_invoker
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{
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template <typename T>
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void operator()(T *) const
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{
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if (dtype::get_builtin<T>() == m_dtype)
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{
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m_func.Function::template apply<T>();
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throw dtype_template_match_found();
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}
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}
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dtype_template_invoker(dtype const & dtype_, Function func)
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: m_dtype(dtype_), m_func(func) {}
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private:
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dtype const & m_dtype;
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Function m_func;
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};
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template <typename Function>
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struct dtype_template_invoker< boost::reference_wrapper<Function> >
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{
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template <typename T>
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void operator()(T *) const
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{
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if (dtype::get_builtin<T>() == m_dtype)
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{
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m_func.Function::template apply<T>();
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throw dtype_template_match_found();
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}
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}
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dtype_template_invoker(dtype const & dtype_, Function & func)
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: m_dtype(dtype_), m_func(func) {}
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private:
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dtype const & m_dtype;
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Function & m_func;
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};
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template <typename Function>
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struct nd_template_invoker
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{
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template <int N>
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void operator()(boost::mpl::integral_c<int,N> *) const
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{
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if (m_nd == N)
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{
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m_func.Function::template apply<N>();
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throw nd_template_match_found();
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}
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}
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nd_template_invoker(int nd, Function func) : m_nd(nd), m_func(func) {}
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private:
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int m_nd;
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Function m_func;
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};
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template <typename Function>
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struct nd_template_invoker< boost::reference_wrapper<Function> >
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{
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template <int N>
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void operator()(boost::mpl::integral_c<int,N> *) const
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{
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if (m_nd == N)
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{
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m_func.Function::template apply<N>();
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throw nd_template_match_found();
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}
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}
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nd_template_invoker(int nd, Function & func) : m_nd(nd), m_func(func) {}
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private:
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int m_nd;
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Function & m_func;
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};
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} // namespace boost::python::numpy::detail
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template <typename Sequence, typename Function>
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void invoke_matching_nd(int nd, Function f)
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{
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detail::nd_template_invoker<Function> invoker(nd, f);
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try { boost::mpl::for_each< Sequence, detail::add_pointer_meta >(invoker);}
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catch (detail::nd_template_match_found &) { return;}
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PyErr_SetString(PyExc_TypeError, "number of dimensions not found in template list.");
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python::throw_error_already_set();
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}
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template <typename Sequence, typename Function>
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void invoke_matching_dtype(dtype const & dtype_, Function f)
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{
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detail::dtype_template_invoker<Function> invoker(dtype_, f);
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try { boost::mpl::for_each< Sequence, detail::add_pointer_meta >(invoker);}
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catch (detail::dtype_template_match_found &) { return;}
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PyErr_SetString(PyExc_TypeError, "dtype not found in template list.");
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python::throw_error_already_set();
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}
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namespace detail
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{
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template <typename T, typename Function>
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struct array_template_invoker_wrapper_2
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{
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template <int N>
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void apply() const { m_func.Function::template apply<T,N>();}
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array_template_invoker_wrapper_2(Function & func) : m_func(func) {}
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private:
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Function & m_func;
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};
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template <typename DimSequence, typename Function>
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struct array_template_invoker_wrapper_1
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{
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template <typename T>
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void apply() const { invoke_matching_nd<DimSequence>(m_nd, array_template_invoker_wrapper_2<T,Function>(m_func));}
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array_template_invoker_wrapper_1(int nd, Function & func) : m_nd(nd), m_func(func) {}
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private:
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int m_nd;
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Function & m_func;
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};
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template <typename DimSequence, typename Function>
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struct array_template_invoker_wrapper_1< DimSequence, boost::reference_wrapper<Function> >
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: public array_template_invoker_wrapper_1< DimSequence, Function >
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{
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array_template_invoker_wrapper_1(int nd, Function & func)
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: array_template_invoker_wrapper_1< DimSequence, Function >(nd, func) {}
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};
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} // namespace boost::python::numpy::detail
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template <typename TypeSequence, typename DimSequence, typename Function>
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void invoke_matching_array(ndarray const & array_, Function f)
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{
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detail::array_template_invoker_wrapper_1<DimSequence,Function> wrapper(array_.get_nd(), f);
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invoke_matching_dtype<TypeSequence>(array_.get_dtype(), wrapper);
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}
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}}} // namespace boost::python::numpy
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#endif
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