/usr/include/xtensor/xview_utils.hpp is in xtensor-dev 0.10.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2016, Johan Mabille, Sylvain Corlay and Wolf Vollprecht *
* *
* Distributed under the terms of the BSD 3-Clause License. *
* *
* The full license is in the file LICENSE, distributed with this software. *
****************************************************************************/
#ifndef XVIEW_UTILS_HPP
#define XVIEW_UTILS_HPP
#include <array>
#include "xslice.hpp"
namespace xt
{
/********************************
* helper functions declaration *
********************************/
// number of integral types in the specified sequence of types
template <class... S>
constexpr std::size_t integral_count();
// number of integral types in the specified sequence of types before specified index
template <class... S>
constexpr std::size_t integral_count_before(std::size_t i);
// index in the specified sequence of types of the ith non-integral type
template <class... S>
constexpr std::size_t integral_skip(std::size_t i);
// number of newaxis types in the specified sequence of types
template <class... S>
constexpr std::size_t newaxis_count();
// number of newaxis types in the specified sequence of types before specified index
template <class... S>
constexpr std::size_t newaxis_count_before(std::size_t i);
// index in the specified sequence of types of the ith non-newaxis type
template <class... S>
constexpr std::size_t newaxis_skip(std::size_t i);
// return slice evaluation and increment iterator
template <class S, class It>
inline disable_xslice<S, std::size_t> get_slice_value(const S& s, It&) noexcept
{
return s;
}
template <class S, class It>
inline auto get_slice_value(const xslice<S>& slice, It& it) noexcept
{
return slice.derived_cast()(typename S::size_type(*it++));
}
/***********************
* view_temporary_type *
***********************/
namespace detail
{
template <class T, class S, layout_type L, class... SL>
struct view_temporary_type_impl
{
using type = xarray<T, L>;
};
template <class T, class I, std::size_t N, layout_type L, class... SL>
struct view_temporary_type_impl<T, std::array<I, N>, L, SL...>
{
using type = xtensor<T, N + newaxis_count<SL...>() - integral_count<SL...>(), L>;
};
}
template <class E, class... SL>
struct view_temporary_type
{
using type = typename detail::view_temporary_type_impl<typename E::value_type,
typename E::shape_type,
E::static_layout,
SL...>::type;
};
template <class E, class... SL>
using view_temporary_type_t = typename view_temporary_type<E, SL...>::type;
/************************
* count integral types *
************************/
namespace detail
{
template <class T, class... S>
struct integral_count_impl
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i ? (integral_count_impl<S...>::count(i - 1) + (std::is_integral<std::remove_reference_t<T>>::value ? 1 : 0)) : 0;
}
};
template <>
struct integral_count_impl<void>
{
static constexpr std::size_t count(std::size_t /*i*/) noexcept
{
return 0;
}
};
}
template <class... S>
constexpr std::size_t integral_count()
{
return detail::integral_count_impl<S..., void>::count(sizeof...(S));
}
template <class... S>
constexpr std::size_t integral_count_before(std::size_t i)
{
return detail::integral_count_impl<S..., void>::count(i);
}
/***********************
* count newaxis types *
***********************/
namespace detail
{
template <class T>
struct is_newaxis : std::false_type
{
};
template <class T>
struct is_newaxis<xnewaxis<T>> : public std::true_type
{
};
template <class T, class... S>
struct newaxis_count_impl
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i ? (newaxis_count_impl<S...>::count(i - 1) + (is_newaxis<std::remove_reference_t<T>>::value ? 1 : 0)) : 0;
}
};
template <>
struct newaxis_count_impl<void>
{
static constexpr std::size_t count(std::size_t /*i*/) noexcept
{
return 0;
}
};
}
template <class... S>
constexpr std::size_t newaxis_count()
{
return detail::newaxis_count_impl<S..., void>::count(sizeof...(S));
}
template <class... S>
constexpr std::size_t newaxis_count_before(std::size_t i)
{
return detail::newaxis_count_impl<S..., void>::count(i);
}
/**********************************
* index of ith non-integral type *
**********************************/
namespace detail
{
template <class T, class... S>
struct integral_skip_impl
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i == 0 ? count_impl() : count_impl(i);
}
private:
static constexpr std::size_t count_impl(std::size_t i) noexcept
{
return 1 + (
std::is_integral<std::remove_reference_t<T>>::value ?
integral_skip_impl<S...>::count(i) :
integral_skip_impl<S...>::count(i - 1)
);
}
static constexpr std::size_t count_impl() noexcept
{
return std::is_integral<std::remove_reference_t<T>>::value ? 1 + integral_skip_impl<S...>::count(0) : 0;
}
};
template <>
struct integral_skip_impl<void>
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i;
}
};
}
template <class... S>
constexpr std::size_t integral_skip(std::size_t i)
{
return detail::integral_skip_impl<S..., void>::count(i);
}
/*********************************
* index of ith non-newaxis type *
*********************************/
namespace detail
{
template <class T, class... S>
struct newaxis_skip_impl
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i == 0 ? count_impl() : count_impl(i);
}
private:
static constexpr std::size_t count_impl(std::size_t i) noexcept
{
return 1 + (
is_newaxis<std::remove_reference_t<T>>::value ?
newaxis_skip_impl<S...>::count(i) :
newaxis_skip_impl<S...>::count(i - 1)
);
}
static constexpr std::size_t count_impl() noexcept
{
return is_newaxis<std::remove_reference_t<T>>::value ? 1 + newaxis_skip_impl<S...>::count(0) : 0;
}
};
template <>
struct newaxis_skip_impl<void>
{
static constexpr std::size_t count(std::size_t i) noexcept
{
return i;
}
};
}
template <class... S>
constexpr std::size_t newaxis_skip(std::size_t i)
{
return detail::newaxis_skip_impl<S..., void>::count(i);
}
}
#endif
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