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Telegram/lib_crl/crl/qt/crl_qt_guards.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <crl/common/crl_common_config.h>
+
+#if __has_include(<QtCore/QPointer>)
+
+class QObject;
+
+template <typename T>
+class QPointer;
+
+template <typename T>
+class QWeakPointer;
+
+template <typename T>
+class QSharedPointer;
+
+#if __has_include(<gsl/gsl>)
+
+namespace gsl {
+
+template <typename T>
+class not_null;
+
+} // namespace gsl
+
+#endif // gsl
+
+namespace crl {
+
+template <typename T, typename Enable>
+struct guard_traits;
+
+template <typename T>
+struct guard_traits<QPointer<T>, void> {
+	static QPointer<T> create(const QPointer<T> &value) {
+		return value;
+	}
+	static QPointer<T> create(QPointer<T> &&value) {
+		return std::move(value);
+	}
+	static bool check(const QPointer<T> &guard) {
+		return guard.data() != nullptr;
+	}
+
+};
+
+template <typename T>
+struct guard_traits<
+	T*,
+	std::enable_if_t<
+		std::is_base_of_v<QObject, std::remove_cv_t<T>>>> {
+	static QPointer<T> create(T *value) {
+		return value;
+	}
+	static bool check(const QPointer<T> &guard) {
+		return guard.data() != nullptr;
+	}
+
+};
+
+#if __has_include(<gsl/gsl>)
+
+template <typename T>
+struct guard_traits<
+	gsl::not_null<T*>,
+	std::enable_if_t<
+		std::is_base_of_v<QObject, std::remove_cv_t<T>>>> {
+	static QPointer<T> create(gsl::not_null<T*> value) {
+		return value.get();
+	}
+	static bool check(const QPointer<T> &guard) {
+		return guard.data() != nullptr;
+	}
+
+};
+
+#endif // gsl
+
+template <typename T>
+struct guard_traits<QWeakPointer<T>, void> {
+	static QWeakPointer<T> create(const QWeakPointer<T> &value) {
+		return value;
+	}
+	static QWeakPointer<T> create(QWeakPointer<T> &&value) {
+		return std::move(value);
+	}
+	static bool check(const QWeakPointer<T> &guard) {
+		return guard.toStrongRef() != nullptr;
+	}
+
+};
+
+template <typename T>
+struct guard_traits<QSharedPointer<T>, void> {
+	static QWeakPointer<T> create(const QSharedPointer<T> &value) {
+		return value;
+	}
+	static QWeakPointer<T> create(QSharedPointer<T> &&value) {
+		return value;
+	}
+	static bool check(const QWeakPointer<T> &guard) {
+		return guard.toStrongRef() != nullptr;
+	}
+
+};
+
+} // namespace crl
+
+#endif // Qt