stringsource.h

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#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