streamcharsource.h
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streamcharsource.h
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	#pragma once

	#ifndef STREAMCHARSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
	#define STREAMCHARSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66


	#include "noncopyable.h"
	#include <cstddef>

	namespace YAML
	{
	class StreamCharSource
	{
	public:
	StreamCharSource(const Stream& stream): m_offset(0), m_stream(stream) {}
	StreamCharSource(const StreamCharSource& source): m_offset(source.m_offset), m_stream(source.m_stream) {}
	~StreamCharSource() {}

	operator bool() const;
	char operator [] (std::size_t i) const { return m_stream.CharAt(m_offset + i); }
	bool operator !() const { return !static_cast<bool>(*this); }

	const StreamCharSource operator + (int i) const;

	private:
	std::size_t m_offset;
	const Stream& m_stream;

	StreamCharSource& operator = (const StreamCharSource&); // non-assignable
	};

	inline StreamCharSource::operator bool() const {
	return m_stream.ReadAheadTo(m_offset);
	}

	inline const StreamCharSource StreamCharSource::operator + (int i) const {
	StreamCharSource source(*this);
	if(static_cast<int> (source.m_offset) + i >= 0)
	source.m_offset += i;
	else
	source.m_offset = 0;
	return source;
	}
	}

	#endif // STREAMCHARSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66