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zarray_impl.hpp
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271 lines (207 loc) · 6.71 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_ZARRAY_IMPL_HPP
#define XTENSOR_ZARRAY_IMPL_HPP
#include "xarray.hpp"
namespace xt
{
/*************************
* zarray_expression_tag *
*************************/
struct zarray_expression_tag {};
namespace extension
{
template <>
struct expression_tag_and<xtensor_expression_tag, zarray_expression_tag>
{
using type = zarray_expression_tag;
};
template <>
struct expression_tag_and<zarray_expression_tag, xtensor_expression_tag>
: expression_tag_and<xtensor_expression_tag, zarray_expression_tag>
{
};
template <>
struct expression_tag_and<zarray_expression_tag, zarray_expression_tag>
{
using type = zarray_expression_tag;
};
}
/***************
* zarray_impl *
***************/
class zarray_impl
{
public:
using self_type = zarray_impl;
virtual ~zarray_impl() = default;
zarray_impl(zarray_impl&&) = delete;
zarray_impl& operator=(const zarray_impl&) = delete;
zarray_impl& operator=(zarray_impl&&) = delete;
virtual self_type* clone() const = 0;
XTL_IMPLEMENT_INDEXABLE_CLASS()
protected:
zarray_impl() = default;
zarray_impl(const zarray_impl&) = default;
};
/****************
* ztyped_array *
****************/
template <class T>
class ztyped_array : public zarray_impl
{
public:
virtual ~ztyped_array() = default;
virtual xarray<T>& get_array() = 0;
virtual const xarray<T>& get_array() const = 0;
XTL_IMPLEMENT_INDEXABLE_CLASS()
protected:
ztyped_array() = default;
ztyped_array(const ztyped_array&) = default;
};
/***********************
* zexpression_wrapper *
***********************/
template <class CTE>
class zexpression_wrapper : public ztyped_array<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_array<value_type>;
template <class E>
zexpression_wrapper(E&& e);
virtual ~zexpression_wrapper() = default;
xarray<value_type>& get_array() override;
const xarray<value_type>& get_array() const override;
self_type* clone() const override;
private:
zexpression_wrapper(const zexpression_wrapper&) = default;
void compute_cache() const;
CTE m_expression;
mutable xarray<value_type> m_cache;
mutable bool m_cache_initialized;
};
/******************
* zarray_wrapper *
******************/
template <class CTE>
class zarray_wrapper : public ztyped_array<typename std::decay_t<CTE>::value_type>
{
public:
using self_type = zarray_wrapper;
using value_type = typename std::decay_t<CTE>::value_type;
using base_type = ztyped_array<value_type>;
template <class E>
zarray_wrapper(E&& e);
virtual ~zarray_wrapper() = default;
xarray<value_type>& get_array() override;
const xarray<value_type>& get_array() const override;
self_type* clone() const override;
private:
zarray_wrapper(const zarray_wrapper&) = default;
CTE m_array;
};
/***********************
* zexpression_wrapper *
***********************/
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)
{
}
template <class CTE>
inline auto zexpression_wrapper<CTE>::get_array() -> xarray<value_type>&
{
compute_cache();
return m_cache;
}
template <class CTE>
inline auto zexpression_wrapper<CTE>::get_array() const -> const xarray<value_type>&
{
compute_cache();
return m_cache;
}
template <class CTE>
inline auto zexpression_wrapper<CTE>::clone() const -> self_type*
{
return new self_type(*this);
}
template <class CTE>
inline void zexpression_wrapper<CTE>::compute_cache() const
{
if (!m_cache_initialized)
{
m_cache = m_expression;
m_cache_initialized = true;
}
}
/******************
* zarray_wrapper *
******************/
template <class CTE>
template <class E>
inline zarray_wrapper<CTE>::zarray_wrapper(E&& e)
: base_type()
, m_array(std::forward<E>(e))
{
}
template <class CTE>
inline auto zarray_wrapper<CTE>::get_array() -> xarray<value_type>&
{
return m_array;
}
template <class CTE>
inline auto zarray_wrapper<CTE>::get_array() const -> const xarray<value_type>&
{
return m_array;
}
template <class CTE>
inline auto zarray_wrapper<CTE>::clone() const -> self_type*
{
return new self_type(*this);
}
/******************
* zarray builder *
******************/
namespace detail
{
template <class E>
struct is_xarray : std::false_type
{
};
template <class T, layout_type L, class A, class SA>
struct is_xarray<xarray<T, L, A, SA>> : std::true_type
{
};
template <class E>
struct zwrapper_builder
{
using closure_type = xtl::closure_type_t<E>;
using wrapper_type = std::conditional_t<is_xarray<std::decay_t<E>>::value,
zarray_wrapper<closure_type>,
zexpression_wrapper<closure_type>>;
template <class OE>
static wrapper_type* run(OE&& e)
{
return new wrapper_type(std::forward<OE>(e));
}
};
template <class E>
inline auto build_zarray(E&& e)
{
return zwrapper_builder<E>::run(std::forward<E>(e));
}
}
}
#endif