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Telegram/lib_tl/tl/tl_boxed.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 "base/basic_types.h"
+
+#include <QtCore/QVector>
+
+namespace tl {
+
+template <typename Accumulator>
+struct Writer;
+
+template <typename bare>
+class boxed : public bare {
+public:
+	using bare::bare;
+
+	boxed() = default;
+	boxed(const boxed<bare> &v) = default;
+	boxed<bare> &operator=(const boxed<bare> &v) & = default;
+	boxed(const bare &v) : bare(v) {
+	}
+	boxed<bare> &operator=(const bare &v) & {
+		*((bare*)this) = v;
+		return *this;
+	}
+
+	template <typename Prime>
+	[[nodiscard]] bool read(const Prime *&from, const Prime *end, uint32 cons = 0) {
+		if (!Reader<Prime>::Has(1, from, end)) {
+			return false;
+		}
+		cons = Reader<Prime>::Get(from, end);
+		return bare::read(from, end, cons);
+	}
+	template <typename Accumulator>
+	void write(Accumulator &to) const {
+		Writer<Accumulator>::Put(to, bare::type());
+		bare::write(to);
+	}
+
+	using Unboxed = bare;
+
+};
+
+template <typename T>
+class boxed<boxed<T> > {
+	using Unboxed = typename T::CantMakeBoxedBoxedType;
+};
+
+template <typename T>
+struct is_boxed : std::false_type {
+};
+
+template <typename T>
+struct is_boxed<boxed<T>> : std::true_type {
+};
+
+template <typename T>
+inline constexpr bool is_boxed_v = is_boxed<T>::value;
+
+} // namespace tl