1 files changed, 107 insertions, 0 deletions
diff --git a/include/value.h b/include/value.h
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+++ b/include/value.h
@@ -0,0 +1,107 @@
+/*
+ * libnbt++ - A library for the Minecraft Named Binary Tag format.
+ * Copyright (C) 2013, 2015  ljfa-ag
+ *
+ * This file is part of libnbt++.
+ *
+ * libnbt++ is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libnbt++ is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libnbt++.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef TAG_REF_PROXY_H_INCLUDED
+#define TAG_REF_PROXY_H_INCLUDED
+
+#include "tag.h"
+#include <memory>
+#include <string>
+
+namespace nbt
+{
+
+//Forward declarations
+class tag_compound;
+class tag_list;
+
+/**
+ * @brief Contains an NBT value of fixed type
+ *
+ * A wrapper class that can contain a tag of an arbitrary but fixed type.
+ * Casting or assigning incompatible types will throw an exception.
+ * It can also refer to an uninitialized value (e.g. when using tag_compound::operator[]
+ * with a non-existant key).
+ */
+class value
+{
+public:
+    //Movable but not (implicitly) copyable
+    value(const value&) = delete;
+    value(value&&) = default;
+    value& operator=(const value&) = delete;
+    value& operator=(value&&) = default;
+
+    //value& operator=(std::unique_ptr<tag>&& ptr);
+
+    //Assignment
+    /**
+     * @brief Assigns the given value to the tag if the type matches
+     * @throw std::bad_cast if the value is not convertible to the tag type
+     * via a widening conversion
+     */
+    value& operator=(int8_t val);
+    value& operator=(int16_t val);
+    value& operator=(int32_t val);
+    value& operator=(int64_t val);
+    value& operator=(float val);
+    value& operator=(double val);
+    value& operator=(const std::string& str);
+    value& operator=(tag_compound&& comp);
+    value& operator=(tag_list&& list);
+
+    //Conversion to tag
+    operator tag&();
+    operator const tag&() const;
+
+    //Conversions to primitives and string
+    /**
+     * @brief Casts the value if the type matches
+     * @throw std::bad_cast if the tag type is not convertible to the desired
+     * type via a widening conversion
+     */
+    explicit operator int8_t() const;
+    explicit operator int16_t() const;
+    explicit operator int32_t() const;
+    explicit operator int64_t() const;
+    explicit operator float() const;
+    explicit operator double() const;
+    explicit operator const std::string&() const;
+
+    /**
+     * @brief In case of a tag_compound, accesses a tag by key
+     * @throw std::bad_cast if the tag type is not tag_compound
+     * @sa tag_compound::operator[]
+     */
+    value& operator[](const std::string& key);
+    const value& operator[](const std::string& key) const;
+
+    ///@sa tag::get_type
+    tag_type get_type() const;
+
+    friend bool operator==(const value& lhs, const value& rhs);
+    friend bool operator!=(const value& lhs, const value& rhs);
+
+private:
+    std::unique_ptr<tag> tag_;
+};
+
+}
+
+#endif // TAG_REF_PROXY_H_INCLUDED