#ifndef STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM
#define STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM

#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif


#include <cstddef>

namespace YAML_PM
{
	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;
		}
		
		StringCharSource& operator += (std::size_t offset) {
			m_offset += offset;
			return *this;
		}
	private:
		const char *m_str;
		std::size_t m_size;
		std::size_t m_offset;
	};
}

#endif // STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM
