<commit_before>#pragma once
#ifndef YOU_DATASTORE_INTERNAL_INTERNAL_DATASTORE_H_
#define YOU_DATASTORE_INTERNAL_INTERNAL_DATASTORE_H_

#include <cstdint>
#include <functional>
#include <unordered_map>
#include "boost/variant.hpp"
#include "boost/lexical_cast.hpp"
#include "pugixml.hpp"
#include "../task_typedefs.h"

namespace You {
namespace DataStore {
namespace UnitTests {
class DataStoreTest;
}
namespace Internal {

/// The most primitive class that does the changes to the actual xml file
class InternalDataStore {
	/// Test classes
	friend class You::DataStore::UnitTests::DataStoreTest;
public:
	/// Insert a task into the datastore
	/// \return true if insertion successful,
	/// \return false if task id already exists
	bool post(TaskId, const SerializedTask&);

	/// Update the content of a task
	/// \return true if update successful,
	/// \return false if task id specified does not exist
	bool put(TaskId, const SerializedTask&);

	/// Get a task
	/// \return false and an empty SerializedTask if task id does not exist
	boost::variant<bool, SerializedTask> get(TaskId);

	/// Delete a task
	/// \return true if erase successful,<commit_msg>Put forward declaration of unit test class in one line with the namespace<commit_after>#pragma once
#ifndef YOU_DATASTORE_INTERNAL_INTERNAL_DATASTORE_H_
#define YOU_DATASTORE_INTERNAL_INTERNAL_DATASTORE_H_

#include <cstdint>
#include <functional>
#include <unordered_map>
#include "boost/variant.hpp"
#include "boost/lexical_cast.hpp"
#include "pugixml.hpp"
#include "../task_typedefs.h"

namespace You {
namespace DataStore {
namespace UnitTests { class DataStoreTest; }

/// The internal components of DataStore
namespace Internal {

/// The most primitive class that does the changes to the actual xml file
class InternalDataStore {
	/// Test classes
	friend class You::DataStore::UnitTests::DataStoreTest;
public:
	/// Insert a task into the datastore
	/// \return true if insertion successful,
	/// \return false if task id already exists
	bool post(TaskId, const SerializedTask&);

	/// Update the content of a task
	/// \return true if update successful,
	/// \return false if task id specified does not exist
	bool put(TaskId, const SerializedTask&);

	/// Get a task
	/// \return false and an empty SerializedTask if task id does not exist
	boost::variant<bool, SerializedTask> get(TaskId);

	/// Delete a task
	/// \return true if erase successful,
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