Poll data and updates handling added.

Telegram/SourceFiles/data/data_poll.h

@@ -0,0 +1,46 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+struct PollAnswer {
+	QString text;
+	QByteArray option;
+	int votes = 0;
+	bool chosen = false;
+};
+
+inline bool operator==(const PollAnswer &a, const PollAnswer &b) {
+	return (a.text == b.text)
+		&& (a.option == b.option);
+}
+
+inline bool operator!=(const PollAnswer &a, const PollAnswer &b) {
+	return !(a == b);
+}
+
+struct PollData {
+	explicit PollData(PollId id);
+
+	bool applyChanges(const MTPDpoll &poll);
+	bool applyResults(const MTPPollResults &results);
+
+	PollAnswer *answerByOption(const QByteArray &option);
+	const PollAnswer *answerByOption(const QByteArray &option) const;
+
+	PollId id = 0;
+	QString question;
+	std::vector<PollAnswer> answers;
+	int totalVoters = 0;
+	bool closed = false;
+
+private:
+	bool applyResultToAnswers(
+		const MTPPollAnswerVoters &result,
+		bool isMinResults);
+
+};