mirror of
https://github.com/pocketpy/pocketpy
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105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
/***************************************************************************
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* Copyright (c) Johan Mabille, Sylvain Corlay and Wolf Vollprecht *
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* Copyright (c) QuantStack *
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* *
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* Distributed under the terms of the BSD 3-Clause License. *
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* *
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* The full license is in the file LICENSE, distributed with this software. *
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****************************************************************************/
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#ifndef XTENSOR_LAYOUT_HPP
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#define XTENSOR_LAYOUT_HPP
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#include <type_traits>
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// Do not include anything else here.
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// xlayout.hpp is included in xtensor_forward.hpp
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// and we don't want to bring other headers to it.
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#include "xtensor_config.hpp"
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namespace xt
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{
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/*! layout_type enum for xcontainer based xexpressions */
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enum class layout_type
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{
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/*! dynamic layout_type: you can resize to row major, column major, or use custom strides */
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dynamic = 0x00,
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/*! layout_type compatible with all others */
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any = 0xFF,
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/*! row major layout_type */
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row_major = 0x01,
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/*! column major layout_type */
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column_major = 0x02
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};
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/**
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* Implementation of the following logical table:
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*
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* | d | a | r | c |
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* --+---+---+---+---+
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* d | d | d | d | d |
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* a | d | a | r | c |
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* r | d | r | r | d |
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* c | d | c | d | c |
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* d = dynamic, a = any, r = row_major, c = column_major.
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*
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* Using bitmasks to avoid nested if-else statements.
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*
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* @param args the input layouts.
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* @return the output layout, computed with the previous logical table.
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*/
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template <class... Args>
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constexpr layout_type compute_layout(Args... args) noexcept;
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constexpr layout_type default_assignable_layout(layout_type l) noexcept;
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constexpr layout_type layout_remove_any(const layout_type layout) noexcept;
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/******************
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* Implementation *
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******************/
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namespace detail
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{
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constexpr layout_type compute_layout_impl() noexcept
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{
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return layout_type::any;
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}
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constexpr layout_type compute_layout_impl(layout_type l) noexcept
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{
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return l;
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}
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constexpr layout_type compute_layout_impl(layout_type lhs, layout_type rhs) noexcept
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{
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using type = std::underlying_type_t<layout_type>;
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return layout_type(static_cast<type>(lhs) & static_cast<type>(rhs));
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}
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template <class... Args>
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constexpr layout_type compute_layout_impl(layout_type lhs, Args... args) noexcept
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{
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return compute_layout_impl(lhs, compute_layout_impl(args...));
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}
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}
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template <class... Args>
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constexpr layout_type compute_layout(Args... args) noexcept
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{
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return detail::compute_layout_impl(args...);
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}
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constexpr layout_type default_assignable_layout(layout_type l) noexcept
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{
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return (l == layout_type::row_major || l == layout_type::column_major) ? l : XTENSOR_DEFAULT_LAYOUT;
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}
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constexpr layout_type layout_remove_any(const layout_type layout) noexcept
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{
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return layout == layout_type::any ? XTENSOR_DEFAULT_LAYOUT : layout;
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}
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}
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#endif
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