df0bf6fa5f
DbAccessor: -Guarantees that access to Vertex and Edge is possible only through Vertex::Accessor and Edge::Accessor. -Guarantees that changing Vertex and Edge is possible only using Vertex::Accessor returned by vertex_insert() method and Edge::Accessor returned by edge_insert() method. -Offers CRUD for Vertex and Edge except iterating over all edges. Squashed commit messages: First step in database accessor refactoring done. It's compiling. All tests with exception of integration_querys pass Tests now initialize logging facilities. Refactored accessors. RecordAccessor now has 3 states. From,To,Out,In in there respecive Accessors return unfilled RecordAccessor. Added iterator classes into utils/itearator/.
96 lines
1.7 KiB
C++
96 lines
1.7 KiB
C++
#pragma once
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#include <ext/aligned_buffer.h>
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#include <utility>
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template <class T>
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class Option
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{
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public:
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Option() {}
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Option(T const &item)
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{
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new (data._M_addr()) T(item);
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initialized = true;
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}
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Option(T &&item)
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{
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new (data._M_addr()) T(std::move(item));
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initialized = true;
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}
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Option(Option &other) = default;
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Option(Option &&other) noexcept
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{
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if (other.initialized) {
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data = std::move(other.data);
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other.initialized = false;
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initialized = true;
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}
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}
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~Option()
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{
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if (initialized) get().~T();
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}
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Option<T> &operator=(Option<T> &&other)
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{
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if (initialized) {
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get().~T();
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initialized = false;
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}
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if (other.initialized) {
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data = std::move(other.data);
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other.initialized = false;
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initialized = true;
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}
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return *this;
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}
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bool is_present() const { return initialized; }
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T &get() noexcept
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{
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assert(initialized);
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return *data._M_ptr();
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}
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const T &get() const noexcept { assert(initialized); }
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T take()
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{
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assert(initialized);
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initialized = false;
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return std::move(*data._M_ptr());
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}
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explicit operator bool() const { return initialized; }
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private:
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__gnu_cxx::__aligned_buffer<T> data;
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bool initialized = false;
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};
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template <class T>
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auto make_option()
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{
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return Option<T>();
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}
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template <class T>
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auto make_option(T &&data)
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{
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return Option<T>(std::move(data));
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}
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template <class T>
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auto make_option_const(const T &&data)
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{
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return Option<const T>(std::move(data));
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}
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