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zexpression_wrapper.hpp
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287 lines (232 loc) · 8.51 KB
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/***************************************************************************
* Copyright (c) Johan Mabille, Sylvain Corlay and Wolf Vollprecht *
* Copyright (c) QuantStack *
* *
* Distributed under the terms of the BSD 3-Clause License. *
* *
* The full license is in the file LICENSE, distributed with this software. *
****************************************************************************/
#ifndef XTENSOR_ZEXPRESSION_WRAPPER_HPP
#define XTENSOR_ZEXPRESSION_WRAPPER_HPP
#include "zarray_impl.hpp"
namespace xt
{
/***********************
* zexpression_wrapper *
***********************/
template <class T>
class ztyped_expression_wrapper : public ztyped_array<T>
{
public:
virtual ~ztyped_expression_wrapper() = default;
virtual void assign(xarray<T>&& rhs) = 0;
};
template <class CTE>
class zexpression_wrapper : public ztyped_expression_wrapper<typename std::decay_t<CTE>::value_type>
{
public:
using self_type = zexpression_wrapper<CTE>;
using value_type = typename std::decay_t<CTE>::value_type;
using base_type = ztyped_expression_wrapper<value_type>;
using shape_type = typename base_type::shape_type;
using slice_vector = typename base_type::slice_vector;
template <class E>
zexpression_wrapper(E&& e);
virtual ~zexpression_wrapper() = default;
bool is_array() const override;
bool is_chunked() const override;
xarray<value_type>& get_array() override;
const xarray<value_type>& get_array() const override;
xarray<value_type> get_chunk(const slice_vector& slices) const override;
void assign(xarray<value_type>&& rhs) override;
self_type* clone() const override;
std::ostream& print(std::ostream& out) const override;
zarray_impl* strided_view(slice_vector& slices) override;
const nlohmann::json& get_metadata() const override;
void set_metadata(const nlohmann::json& metadata) override;
std::size_t dimension() const override;
const shape_type& shape() const override;
void reshape(const shape_type&) override;
void reshape(shape_type&&) override;
void resize(const shape_type&) override;
void resize(shape_type&&) override;
bool broadcast_shape(shape_type& shape, bool reuse_cache = 0) const override;
private:
zexpression_wrapper(const zexpression_wrapper&) = default;
void compute_cache() const;
zarray_impl* strided_view_impl(xstrided_slice_vector& slices, std::true_type);
zarray_impl* strided_view_impl(xstrided_slice_vector& slices, std::false_type);
template <class CT>
using enable_assignable_t = enable_assignable_expression<CT, xarray<value_type>>;
template <class CT>
using enable_not_assignable_t = enable_not_assignable_expression<CT, xarray<value_type>>;
template <class CT = CTE>
enable_assignable_t<CT> assign_impl(xarray<value_type>&& rhs);
template <class CT = CTE>
enable_not_assignable_t<CT> assign_impl(xarray<value_type>&& rhs);
template <class CT = CTE>
enable_assignable_t<CT> resize_impl();
template <class CT = CTE>
enable_not_assignable_t<CT> resize_impl();
CTE m_expression;
mutable xarray<value_type> m_cache;
mutable bool m_cache_initialized;
shape_type m_shape;
nlohmann::json m_metadata;
};
/**************************************
* zexpression_wrapper implementation *
**************************************/
template <class CTE>
template <class E>
inline zexpression_wrapper<CTE>::zexpression_wrapper(E&& e)
: base_type()
, m_expression(std::forward<E>(e))
, m_cache()
, m_cache_initialized(false)
, m_shape(m_expression.dimension())
{
detail::set_data_type<value_type>(m_metadata);
std::copy(m_expression.shape().begin(), m_expression.shape().end(), m_shape.begin());
}
template <class CTE>
bool zexpression_wrapper<CTE>::is_array() const
{
return false;
}
template <class CTE>
bool zexpression_wrapper<CTE>::is_chunked() const
{
return false;
}
template <class CTE>
auto zexpression_wrapper<CTE>::get_array() -> xarray<value_type>&
{
compute_cache();
return m_cache;
}
template <class CTE>
auto zexpression_wrapper<CTE>::get_array() const -> const xarray<value_type>&
{
compute_cache();
return m_cache;
}
template <class CTE>
auto zexpression_wrapper<CTE>::get_chunk(const slice_vector& slices) const -> xarray<value_type>
{
return xt::strided_view(m_expression, slices);
}
template <class CTE>
void zexpression_wrapper<CTE>::assign(xarray<value_type>&& rhs)
{
assign_impl(std::move(rhs));
}
template <class CTE>
auto zexpression_wrapper<CTE>::clone() const -> self_type*
{
return new self_type(*this);
}
template <class CTE>
std::ostream& zexpression_wrapper<CTE>::print(std::ostream& out) const
{
return out << m_expression;
}
template <class CTE>
zarray_impl* zexpression_wrapper<CTE>::strided_view(slice_vector& slices)
{
return strided_view_impl(slices, detail::is_xstrided_view<CTE>());
}
template <class CTE>
inline zarray_impl* zexpression_wrapper<CTE>::strided_view_impl(xstrided_slice_vector& slices, std::true_type)
{
auto e = xt::strided_view(get_array(), slices);
return detail::build_zarray(std::move(e));
}
template <class CTE>
inline zarray_impl* zexpression_wrapper<CTE>::strided_view_impl(xstrided_slice_vector& slices, std::false_type)
{
auto e = xt::strided_view(m_expression, slices);
return detail::build_zarray(std::move(e));
}
template <class CTE>
auto zexpression_wrapper<CTE>::get_metadata() const -> const nlohmann::json&
{
return m_metadata;
}
template <class CTE>
void zexpression_wrapper<CTE>::set_metadata(const nlohmann::json& metadata)
{
m_metadata = metadata;
}
template <class CTE>
std::size_t zexpression_wrapper<CTE>::dimension() const
{
return m_expression.dimension();
}
template <class CTE>
auto zexpression_wrapper<CTE>::shape() const -> const shape_type&
{
return m_shape;
}
template <class CTE>
void zexpression_wrapper<CTE>::reshape(const shape_type&)
{
// No op
}
template <class CTE>
void zexpression_wrapper<CTE>::reshape(shape_type&&)
{
// No op
}
template <class CTE>
void zexpression_wrapper<CTE>::resize(const shape_type&)
{
resize_impl();
}
template <class CTE>
void zexpression_wrapper<CTE>::resize(shape_type&&)
{
resize_impl();
}
template <class CTE>
bool zexpression_wrapper<CTE>::broadcast_shape(shape_type& shape, bool reuse_cache) const
{
return m_expression.broadcast_shape(shape, reuse_cache);
}
template <class CTE>
inline void zexpression_wrapper<CTE>::compute_cache() const
{
if (!m_cache_initialized)
{
noalias(m_cache) = m_expression;
m_cache_initialized = true;
}
}
template <class CTE>
template <class CT>
inline auto zexpression_wrapper<CTE>::assign_impl(xarray<value_type>&& rhs) -> enable_assignable_t<CT>
{
// aliasing is handled before this method, therefore we are sure that
// m_expression is not involved in rhs.
xt::noalias(m_expression) = rhs;
}
template <class CTE>
template <class CT>
inline auto zexpression_wrapper<CTE>::assign_impl(xarray<value_type>&&) -> enable_not_assignable_t<CT>
{
throw std::runtime_error("unevaluated expression is not assignable");
}
template <class CTE>
template <class CT>
inline auto zexpression_wrapper<CTE>::resize_impl() -> enable_assignable_t<CT>
{
// Only wrappers on views are assignable. Resizing is a no op.
}
template <class CTE>
template <class CT>
inline auto zexpression_wrapper<CTE>::resize_impl() -> enable_not_assignable_t<CT>
{
throw std::runtime_error("cannot resize not assignable expression wrapper");
}
}
#endif