mirror of
https://github.com/matrix-construct/construct
synced 2024-11-29 18:22:50 +01:00
129 lines
4 KiB
C++
129 lines
4 KiB
C++
/*
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* charybdis: 21st Century IRC++d
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* util.h: Miscellaneous utilities
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*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_ARRAY_VIEW_H
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namespace ircd
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{
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template<class T> struct array_view;
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}
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template<class T>
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struct ircd::array_view
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{
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using value_type = const T;
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using pointer = value_type *;
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using reference = value_type &;
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using difference_type = size_t;
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using iterator = value_type *;
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using const_iterator = const value_type *;
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value_type *_data { nullptr };
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value_type *_stop { nullptr };
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public:
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const value_type *data() const { return _data; }
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value_type *data() { return _data; }
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size_t size() const { return std::distance(_data, _stop); }
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bool empty() const { return !size(); }
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const_iterator begin() const { return data(); }
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const_iterator end() const { return _stop; }
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const_iterator cbegin() { return data(); }
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const_iterator cend() { return _stop; }
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iterator begin() { return data(); }
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iterator end() { return _stop; }
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const value_type &operator[](const size_t &pos) const
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{
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return *(data() + pos);
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}
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value_type &operator[](const size_t &pos)
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{
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return *(data() + pos);
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}
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const value_type &at(const size_t &pos) const
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range("array_view::range_check");
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return operator[](pos);
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}
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value_type &at(const size_t &pos)
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{
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if(unlikely(pos >= size()))
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throw std::out_of_range("array_view::range_check");
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return operator[](pos);
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}
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array_view(value_type *const &start, value_type *const &stop)
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:_data{start}
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,_stop{stop}
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{}
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array_view(value_type *const &start, const size_t &size)
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:array_view(start, start + size)
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{}
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array_view(const std::initializer_list<value_type> &list)
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:array_view(std::begin(list), std::end(list))
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{}
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template<class U,
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class A>
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array_view(const std::vector<U, A> &v)
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:array_view(v.data(), v.size())
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{}
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template<class U,
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class A>
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array_view(std::vector<U, A> &v)
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:array_view(v.data(), v.size())
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{}
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template<size_t SIZE>
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array_view(value_type (&buffer)[SIZE])
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:array_view(buffer, SIZE)
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{}
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template<class U,
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size_t SIZE>
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array_view(const std::array<U, SIZE> &array)
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:array_view(array.data(), array.size())
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{}
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template<size_t SIZE>
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array_view(std::array<value_type, SIZE> &array)
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:array_view(array.data(), array.size())
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{}
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array_view() = default;
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};
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