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155 lines
3.8 KiB
C++
155 lines
3.8 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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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 appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_LEDGER_READVIEWFWDRANGE_H_INCLUDED
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#define RIPPLE_LEDGER_READVIEWFWDRANGE_H_INCLUDED
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#include <cstddef>
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#include <memory>
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#include <optional>
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namespace ripple {
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class ReadView;
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namespace detail {
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// A type-erased ForwardIterator
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//
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template <class ValueType>
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class ReadViewFwdIter
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{
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public:
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using base_type = ReadViewFwdIter;
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using value_type = ValueType;
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ReadViewFwdIter() = default;
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ReadViewFwdIter(ReadViewFwdIter const&) = default;
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ReadViewFwdIter&
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operator=(ReadViewFwdIter const&) = default;
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virtual ~ReadViewFwdIter() = default;
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virtual std::unique_ptr<ReadViewFwdIter>
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copy() const = 0;
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virtual bool
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equal(ReadViewFwdIter const& impl) const = 0;
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virtual void
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increment() = 0;
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virtual value_type
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dereference() const = 0;
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};
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// A range using type-erased ForwardIterator
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//
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template <class ValueType>
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class ReadViewFwdRange
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{
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public:
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using iter_base = ReadViewFwdIter<ValueType>;
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static_assert(
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std::is_nothrow_move_constructible<ValueType>{},
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"ReadViewFwdRange move and move assign constructors should be "
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"noexcept");
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class iterator
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{
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public:
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using value_type = ValueType;
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using pointer = value_type const*;
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using reference = value_type const&;
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using difference_type = std::ptrdiff_t;
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using iterator_category = std::forward_iterator_tag;
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iterator() = default;
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iterator(iterator const& other);
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iterator(iterator&& other) noexcept;
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// Used by the implementation
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explicit iterator(
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ReadView const* view,
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std::unique_ptr<iter_base> impl);
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iterator&
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operator=(iterator const& other);
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iterator&
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operator=(iterator&& other) noexcept;
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bool
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operator==(iterator const& other) const;
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bool
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operator!=(iterator const& other) const;
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// Can throw
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reference
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operator*() const;
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// Can throw
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pointer
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operator->() const;
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iterator&
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operator++();
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iterator
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operator++(int);
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private:
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ReadView const* view_ = nullptr;
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std::unique_ptr<iter_base> impl_;
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std::optional<value_type> mutable cache_;
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};
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static_assert(std::is_nothrow_move_constructible<iterator>{}, "");
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static_assert(std::is_nothrow_move_assignable<iterator>{}, "");
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using const_iterator = iterator;
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using value_type = ValueType;
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ReadViewFwdRange() = delete;
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ReadViewFwdRange(ReadViewFwdRange const&) = default;
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ReadViewFwdRange&
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operator=(ReadViewFwdRange const&) = default;
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explicit ReadViewFwdRange(ReadView const& view) : view_(&view)
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{
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}
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protected:
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ReadView const* view_;
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};
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} // namespace detail
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} // namespace ripple
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#endif
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