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Telegram/lib_crl/crl/common/crl_common_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>
+
+#include <memory>
+
+namespace crl {
+
+template <typename T, typename Enable>
+struct guard_traits;
+
+
+template <typename T>
+struct guard_traits<std::weak_ptr<T>, void> {
+	static std::weak_ptr<T> create(const std::weak_ptr<T> &value) {
+		return value;
+	}
+	static std::weak_ptr<T> create(std::weak_ptr<T> &&value) {
+		return std::move(value);
+	}
+	static bool check(const std::weak_ptr<T> &guard) {
+		return guard.lock() != nullptr;
+	}
+
+};
+
+template <typename T>
+struct guard_traits<std::shared_ptr<T>, void> {
+	static std::weak_ptr<T> create(const std::shared_ptr<T> &value) {
+		return value;
+	}
+	static std::weak_ptr<T> create(std::shared_ptr<T> &&value) {
+		return value;
+	}
+	static bool check(const std::weak_ptr<T> &guard) {
+		return guard.lock() != nullptr;
+	}
+
+};
+
+} // namespace crl