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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_PRIMITIVE_H_INCLUDED
#define TAG_PRIMITIVE_H_INCLUDED
#include "crtp_tag.h"
#include "primitive_detail.h"
#include "io/stream_reader.h"
#include "io/stream_writer.h"
#include <istream>
#include <sstream>
namespace nbt
{
/**
* @brief Tag that contains an integral or floating-point value
*
* Common class for tag_byte, tag_short, tag_int, tag_long, tag_float and tag_double.
*/
template<class T>
class tag_primitive final : public detail::crtp_tag<tag_primitive<T>>
{
public:
///The type of the value
typedef T value_type;
///The type of the tag
static constexpr tag_type type = detail::get_primitive_type<T>::value;
//Constructor
constexpr tag_primitive(T val = 0) noexcept: value(val) {}
//Getters
operator T&() { return value; }
constexpr operator T() const { return value; }
constexpr T get() const { return value; }
//Setters
tag_primitive& operator=(T val) { value = val; return *this; }
void set(T val) { value = val; }
void read_payload(io::stream_reader& reader) override;
void write_payload(io::stream_writer& writer) const override;
private:
T value;
};
template<class T> bool operator==(const tag_primitive<T>& lhs, const tag_primitive<T>& rhs)
{ return lhs.get() == rhs.get(); }
template<class T> bool operator!=(const tag_primitive<T>& lhs, const tag_primitive<T>& rhs)
{ return !(lhs == rhs); }
//Typedefs that should be used instead of the template tag_primitive.
typedef tag_primitive<int8_t> tag_byte;
typedef tag_primitive<int16_t> tag_short;
typedef tag_primitive<int32_t> tag_int;
typedef tag_primitive<int64_t> tag_long;
typedef tag_primitive<float> tag_float;
typedef tag_primitive<double> tag_double;
template<class T>
void tag_primitive<T>::read_payload(io::stream_reader& reader)
{
reader.read_num(value);
if(!reader.get_istr())
{
std::ostringstream str;
str << "Error reading tag_" << type;
throw io::input_error(str.str());
}
}
template<class T>
void tag_primitive<T>::write_payload(io::stream_writer& writer) const
{
writer.write_num(value);
}
}
#endif // TAG_PRIMITIVE_H_INCLUDED
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