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/*
* 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 convenience wrapper around @c std::unique_ptr<tag>, contains a tag of
* fixed type.
*/
class value
{
public:
value() {}
explicit value(std::unique_ptr<tag>&& t);
//Movable but not (implicitly) copyable
value(const value&) = delete;
value(value&&) = default;
value& operator=(const value&) = delete;
value& operator=(value&&) = default;
/**
* @brief Assigns the given value to the tag if the type matches
* @throw std::bad_cast if the type of @c t is not the same as the type
* of this value
*/
value& operator=(tag&& t);
//Assignment of primitives and string
/**
* @brief Assigns the given value to the tag if the type is compatible
* @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);
//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
*/
operator int8_t() const;
operator int16_t() const;
operator int32_t() const;
operator int64_t() const;
operator float() const;
operator double() const;
operator const std::string&() const;
///Returns true if the contained tag is not @c nullptr
explicit operator bool() const;
/**
* @brief In case of a tag_compound, accesses a tag by key with bounds checking
* @throw std::bad_cast if the tag type is not tag_compound
* @throw std::out_of_range if given key does not exist
* @sa tag_compound::at
*/
value& at(const std::string& key);
const value& at(const std::string& key) 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;
std::unique_ptr<tag>& get_ptr();
const std::unique_ptr<tag>& get_ptr() const;
void set_ptr(std::unique_ptr<tag>&& t);
///@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
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