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/.
50 lines
853 B
C++
50 lines
853 B
C++
#pragma once
|
|
|
|
#include <ext/aligned_buffer.h>
|
|
#include <utility>
|
|
|
|
template <class T>
|
|
class Placeholder
|
|
{
|
|
public:
|
|
Placeholder() = default;
|
|
|
|
Placeholder(Placeholder &) = delete;
|
|
Placeholder(Placeholder &&) = delete;
|
|
|
|
~Placeholder()
|
|
{
|
|
if (initialized) get().~T();
|
|
};
|
|
|
|
bool is_initialized() { return initialized; }
|
|
|
|
T &get() noexcept
|
|
{
|
|
assert(initialized);
|
|
return *data._M_ptr();
|
|
}
|
|
|
|
const T &get() const noexcept
|
|
{
|
|
assert(initialized);
|
|
return *data._M_ptr();
|
|
}
|
|
|
|
void set(const T &item)
|
|
{
|
|
new (data._M_addr()) T(item);
|
|
initialized = true;
|
|
}
|
|
|
|
void set(T &&item)
|
|
{
|
|
new (data._M_addr()) T(std::move(item));
|
|
initialized = true;
|
|
}
|
|
|
|
private:
|
|
__gnu_cxx::__aligned_buffer<T> data;
|
|
bool initialized = false;
|
|
};
|