/usr/include/xtensor/xbuffer_adaptor.hpp is in xtensor-dev 0.10.11-1.
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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 XBUFFER_ADAPTOR_HPP
#define XBUFFER_ADAPTOR_HPP
#include <algorithm>
#include <functional>
#include <iterator>
#include <memory>
#include <stdexcept>
#include "xstorage.hpp"
namespace xt
{
struct no_ownership
{
};
struct acquire_ownership
{
};
namespace detail
{
template <class T, class A>
class xbuffer_storage
{
public:
using self_type = xbuffer_storage<T, A>;
using allocator_type = A;
using value_type = typename allocator_type::value_type;
using reference = typename allocator_type::reference;
using const_reference = typename allocator_type::const_reference;
using pointer = typename allocator_type::pointer;
using const_pointer = typename allocator_type::const_pointer;
using size_type = typename allocator_type::size_type;
using difference_type = typename allocator_type::difference_type;
xbuffer_storage();
xbuffer_storage(T*& data, size_type size, const allocator_type& alloc = allocator_type());
size_type size() const noexcept;
void resize(size_type size);
pointer data() noexcept;
const_pointer data() const noexcept;
void swap(self_type& rhs) noexcept;
private:
pointer p_data;
size_type m_size;
};
template <class T, class A>
class xbuffer_owner_storage
{
public:
using self_type = xbuffer_owner_storage<T, A>;
using allocator_type = A;
using value_type = typename allocator_type::value_type;
using reference = typename allocator_type::reference;
using const_reference = typename allocator_type::const_reference;
using pointer = typename allocator_type::pointer;
using const_pointer = typename allocator_type::const_pointer;
using size_type = typename allocator_type::size_type;
using difference_type = typename allocator_type::difference_type;
xbuffer_owner_storage();
xbuffer_owner_storage(T*& data, size_type size, const allocator_type& alloc = allocator_type());
~xbuffer_owner_storage();
xbuffer_owner_storage(const self_type&) = delete;
self_type& operator=(const self_type&);
xbuffer_owner_storage(self_type&&);
self_type& operator=(self_type&&);
size_type size() const noexcept;
void resize(size_type size);
pointer data() noexcept;
const_pointer data() const noexcept;
allocator_type get_allocator() const noexcept;
void swap(self_type& rhs) noexcept;
private:
pointer* p_data;
size_type m_size;
allocator_type m_allocator;
};
template <class T, class A, class O>
struct get_buffer_storage
{
using type = xbuffer_storage<T, A>;
};
template <class T, class A>
struct get_buffer_storage<T, A, acquire_ownership>
{
using type = xbuffer_owner_storage<T, A>;
};
template <class T, class A, class O>
using buffer_storage_t = typename get_buffer_storage<T, A, O>::type;
}
template <class T, class O = no_ownership, class A = std::allocator<T>>
class xbuffer_adaptor : private detail::buffer_storage_t<T, A, O>
{
public:
using base_type = detail::buffer_storage_t<T, A, O>;
using allocator_type = typename base_type::allocator_type;
using value_type = typename base_type::value_type;
using reference = typename base_type::reference;
using const_reference = typename base_type::const_reference;
using pointer = typename base_type::pointer;
using const_pointer = typename base_type::const_pointer;
using size_type = typename base_type::size_type;
using difference_type = typename base_type::difference_type;
using iterator = pointer;
using const_iterator = const_pointer;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
xbuffer_adaptor() = default;
template <class OW = O, class = std::enable_if_t<std::is_same<OW, acquire_ownership>::value>>
xbuffer_adaptor(T*& data, size_type size, const allocator_type& alloc = allocator_type());
template <class OW = O, class = std::enable_if_t<std::is_same<OW, no_ownership>::value>>
xbuffer_adaptor(T* data, size_type size, const allocator_type& alloc = allocator_type());
bool empty() const noexcept;
using base_type::size;
using base_type::resize;
reference operator[](size_type i);
const_reference operator[](size_type i) const;
reference front();
const_reference front() const;
reference back();
const_reference back() const;
iterator begin();
iterator end();
const_iterator begin() const;
const_iterator end() const;
const_iterator cbegin() const;
const_iterator cend() const;
reverse_iterator rbegin();
reverse_iterator rend();
const_reverse_iterator rbegin() const;
const_reverse_iterator rend() const;
const_reverse_iterator crbegin() const;
const_reverse_iterator crend() const;
using base_type::data;
using base_type::swap;
};
template <class T, class O, class A>
bool operator==(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
bool operator!=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
bool operator<(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
bool operator<=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
bool operator>(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
bool operator>=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs);
template <class T, class O, class A>
void swap(xbuffer_adaptor<T, O, A>& lhs,
xbuffer_adaptor<T, O, A>& rhs) noexcept;
/*******************
* adaptor_closure *
*******************/
namespace detail
{
template <class C>
struct adaptor_closure_impl
{
using type = C&;
};
template <class T, class O, class A>
struct adaptor_closure_impl<xbuffer_adaptor<T, O, A>>
{
using type = xbuffer_adaptor<T, O, A>;
};
}
template <class C>
using adaptor_closure_t = typename detail::adaptor_closure_impl<C>::type;
/**********************************
* xbuffer_storage implementation *
**********************************/
namespace detail
{
template <class T, class A>
inline xbuffer_storage<T, A>::xbuffer_storage()
: p_data(nullptr), m_size(0)
{
}
template <class T, class A>
inline xbuffer_storage<T, A>::xbuffer_storage(T*& data, size_type size, const allocator_type&)
: p_data(data), m_size(size)
{
}
template <class T, class A>
inline auto xbuffer_storage<T, A>::size() const noexcept -> size_type
{
return m_size;
}
template <class T, class A>
inline void xbuffer_storage<T, A>::resize(size_type size)
{
if (size != m_size)
throw std::runtime_error("xbuffer_storage not resizable");
}
template <class T, class A>
inline auto xbuffer_storage<T, A>::data() noexcept -> pointer
{
return p_data;
}
template <class T, class A>
inline auto xbuffer_storage<T, A>::data() const noexcept -> const_pointer
{
return p_data;
}
template <class T, class A>
inline void xbuffer_storage<T, A>::swap(self_type& rhs) noexcept
{
using std::swap;
swap(p_data, rhs.p_data);
swap(m_size, rhs.m_size);
}
}
/****************************************
* xbuffer_owner_storage implementation *
****************************************/
namespace detail
{
template <class T, class A>
inline xbuffer_owner_storage<T, A>::xbuffer_owner_storage()
: p_data(nullptr), m_size(0), m_allocator()
{
}
template <class T, class A>
inline xbuffer_owner_storage<T, A>::xbuffer_owner_storage(T*& data, size_type size, const allocator_type& alloc)
: p_data(&data), m_size(size), m_allocator(alloc)
{
}
template <class T, class A>
inline xbuffer_owner_storage<T, A>::~xbuffer_owner_storage()
{
if (p_data != nullptr)
{
safe_destroy_deallocate(m_allocator, *p_data, m_size);
p_data = nullptr;
m_size = 0;
}
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::operator=(const self_type& rhs) -> self_type&
{
using std::swap;
if (this != &rhs)
{
allocator_type al = std::allocator_traits<allocator_type>::select_on_container_copy_construction(rhs.get_allocator());
pointer tmp = safe_init_allocate(al, rhs.m_size);
if (xtrivially_default_constructible<value_type>::value)
{
std::uninitialized_copy(*(rhs.p_data), *(rhs.p_data) + rhs.m_size, tmp);
}
else
{
std::copy(*(rhs.p_data), *(rhs.p_data) + rhs.m_size, tmp);
}
swap(*p_data, tmp);
m_size = rhs.m_size;
swap(m_allocator, al);
safe_destroy_deallocate(al, tmp, m_size);
}
return *this;
}
template <class T, class A>
inline xbuffer_owner_storage<T, A>::xbuffer_owner_storage(self_type&& rhs)
: p_data(rhs.p_data), m_size(rhs.m_size), m_allocator(std::move(rhs.m_allocator))
{
rhs.p_data = nullptr;
rhs.m_size = 0;
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::operator=(self_type&& rhs) -> self_type&
{
swap(rhs);
return *this;
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::size() const noexcept -> size_type
{
return m_size;
}
template <class T, class A>
void xbuffer_owner_storage<T, A>::resize(size_type size)
{
using std::swap;
if (size != m_size)
{
pointer tmp = safe_init_allocate(m_allocator, size);
swap(*p_data, tmp);
swap(m_size, size);
safe_destroy_deallocate(m_allocator, tmp, size);
}
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::data() noexcept -> pointer
{
return *p_data;
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::data() const noexcept -> const_pointer
{
return *p_data;
}
template <class T, class A>
inline auto xbuffer_owner_storage<T, A>::get_allocator() const noexcept -> allocator_type
{
return allocator_type(m_allocator);
}
template <class T, class A>
inline void xbuffer_owner_storage<T, A>::swap(self_type& rhs) noexcept
{
using std::swap;
swap(p_data, rhs.p_data);
swap(m_size, rhs.m_size);
swap(m_allocator, rhs.m_allocator);
}
}
/**********************************
* xbuffer_adaptor implementation *
**********************************/
template <class T, class O, class A>
template <class OW, class>
inline xbuffer_adaptor<T, O, A>::xbuffer_adaptor(T*& data, size_type size, const allocator_type& alloc)
: base_type(data, size, alloc)
{
}
template <class T, class O, class A>
template <class OW, class>
inline xbuffer_adaptor<T, O, A>::xbuffer_adaptor(T* data, size_type size, const allocator_type& alloc)
: base_type(data, size, alloc)
{
}
template <class T, class O, class A>
bool xbuffer_adaptor<T, O, A>::empty() const noexcept
{
return size() == 0;
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::operator[](size_type i) -> reference
{
return data()[i];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::operator[](size_type i) const -> const_reference
{
return data()[i];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::front() -> reference
{
return data()[0];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::front() const -> const_reference
{
return data()[0];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::back() -> reference
{
return data()[size() - 1];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::back() const -> const_reference
{
return data()[size() - 1];
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::begin() -> iterator
{
return data();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::end() -> iterator
{
return data() + size();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::begin() const -> const_iterator
{
return data();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::end() const -> const_iterator
{
return data() + size();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::cbegin() const -> const_iterator
{
return begin();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::cend() const -> const_iterator
{
return end();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::rbegin() -> reverse_iterator
{
return reverse_iterator(end());
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::rend() -> reverse_iterator
{
return reverse_iterator(begin());
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::rbegin() const -> const_reverse_iterator
{
return const_reverse_iterator(end());
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::rend() const -> const_reverse_iterator
{
return const_reverse_iterator(begin());
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::crbegin() const -> const_reverse_iterator
{
return rbegin();
}
template <class T, class O, class A>
inline auto xbuffer_adaptor<T, O, A>::crend() const -> const_reverse_iterator
{
return rend();
}
template <class T, class O, class A>
inline bool operator==(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return lhs.size() == rhs.size() && std::equal(lhs.begin(), lhs.end(), rhs.begin());
}
template <class T, class O, class A>
inline bool operator!=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return !(lhs == rhs);
}
template <class T, class O, class A>
inline bool operator<(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return std::lexicographical_compare(lhs.begin(), lhs.end(),
rhs.begin(), rhs.end(),
std::less<T>());
}
template <class T, class O, class A>
inline bool operator<=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return std::lexicographical_compare(lhs.begin(), lhs.end(),
rhs.begin(), rhs.end(),
std::less_equal<T>());
}
template <class T, class O, class A>
inline bool operator>(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return std::lexicographical_compare(lhs.begin(), lhs.end(),
rhs.begin(), rhs.end(),
std::greater<T>());
}
template <class T, class O, class A>
inline bool operator>=(const xbuffer_adaptor<T, O, A>& lhs,
const xbuffer_adaptor<T, O, A>& rhs)
{
return std::lexicographical_compare(lhs.begin(), lhs.end(),
rhs.begin(), rhs.end(),
std::greater_equal<T>());
}
template <class T, class O, class A>
inline void swap(xbuffer_adaptor<T, O, A>& lhs,
xbuffer_adaptor<T, O, A>& rhs) noexcept
{
lhs.swap(rhs);
}
}
#endif
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