Builds on windows again

pglab/ASyncDBConnection.h

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+#ifndef ASYNCDBCONNECTION_H
+#define ASYNCDBCONNECTION_H
+
+#include <QObject>
+
+#include "Pgsql_Connection.h"
+#include "Pgsql_Params.h"
+#include "Pgsql_Result.h"
+#include "Expected.h"
+#include "ConnectionConfig.h"
+#include <QElapsedTimer>
+#include <mutex>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/io_service.hpp>
+
+/** \brief Class that handles asynchronous execution of queries.
+ *
+ * Queries are passed to this class with a routine to call on completion
+ * when the result is on that routine is called.
+ */
+class ASyncDBConnection: public QObject {
+    Q_OBJECT
+public:
+	enum class State {
+		NotConnected,
+		Connecting,
+		Connected, ///< connected and idle
+		QuerySend, ///< connected query send expecting result
+		CancelSend, ///< cancel send expecting result
+		Terminating ///< shutting down
+	};
+
+	using on_result_callback = std::function<void(Expected<std::shared_ptr<Pgsql::Result>>, qint64)>;
+
+	explicit ASyncDBConnection(boost::asio::io_service &ios);
+    ~ASyncDBConnection();
+
+	State state() const;
+	void setupConnection(const ConnectionConfig &config);
+	void closeConnection();
+
+	/** Sends command to the server.
+
+	When the result is in on_result will be	called directly within the thread.
+
+	If the command gives multiple results on_result will be called for each result.
+	*/
+	bool send(const std::string &command, on_result_callback on_result);
+	bool send(const std::string &command, Pgsql::Params params, on_result_callback on_result);
+
+	bool cancel();
+    
+signals:
+    void onStateChanged(ASyncDBConnection::State state);
+    void onNotice(Pgsql::ErrorDetails notice);
+
+private:
+	Pgsql::Connection m_connection;
+    boost::asio::ip::tcp::socket m_asioSock;
+	ConnectionConfig m_config;
+	State m_state = State::NotConnected;
+    Pgsql::Canceller m_canceller;
+    
+    QElapsedTimer m_timer;
+    
+    void async_connect_handler(boost::system::error_code ec, std::size_t s);
+    void async_query_handler(boost::system::error_code ec, std::size_t s, on_result_callback on_result);
+    void doStateCallback(State state);
+    void processNotice(const PGresult *result);
+};
+
+Q_DECLARE_METATYPE(ASyncDBConnection::State);
+Q_DECLARE_METATYPE(Pgsql::ErrorDetails);
+
+
+#endif // ASYNCDBCONNECTION_H