gistfile1.cpp

#include <stdexcept>
#include <boost/type_traits.hpp>
#include <boost/utility/enable_if.hpp>

class binstream
{
public:
	struct str
	{
		inline str(char * & output, std::size_t length)
			: output_(output)
			, length_(length)
		{
		}
		char * & output_;
		std::size_t length_;
	};
	struct skip
	{
		inline skip(std::size_t length)
			: length_(length)
		{
		}
		std::size_t length_;
	};
	binstream(char * begin, char * end);
	template <typename T>
	inline typename boost::enable_if<boost::is_arithmetic<T>, binstream &>::type operator>>(T & out)
	{
		if (data_ + sizeof(T) > end_)
			throw std::range_error("reading data out of bounds of binary stream");
		out = *reinterpret_cast<T *>(data_);
		data_ += sizeof(T);
		return *this;
	}
	inline binstream & operator>>(str s)
	{
		if (data_ + s.length_ > end_)
			throw std::range_error("reading data out of bounds of binary stream");
		s.output_ = data_;
		data_ += s.length_;
		return *this;
	}
	inline binstream & operator>>(skip s)
	{
		if (data_ + s.length_ > end_)
			throw std::range_error("reading data out of bounds of binary stream");
		data_ += s.length_;
		return *this;
	}
private:
	char * begin_;
	char * end_;
	char * data_;
};