stringsource.h

#pragma once

#include <cstddef>

namespace YAML
{
	class StringCharSource
	{
	public:
		StringCharSource(const char *str, std::size_t size): m_str(str), m_size(size), m_offset(0) {}

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

		const StringCharSource operator + (int i) const {
			StringCharSource source(*this);
			if(static_cast<int> (source.m_offset) + i >= 0)
				source.m_offset += i;
			else
				source.m_offset = 0;
			return source;
		}
			
		StringCharSource& operator ++ () {
			++m_offset;
			return *this;
		}
	private:
		const char *m_str;
		std::size_t m_size;
		std::size_t m_offset;
	};
}