text: #ifndef STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
  #define STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
  
  #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 {
  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;
  };
  }  // namespace YAML
  
  #endif  // STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
  