streamcharsource.h

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#ifndef STREAMCHARSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM
#define STREAMCHARSOURCE_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 "yaml-cpp-pm/noncopyable.h"
#include <cstddef>

namespace YAML_PM
{
        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_PM