ATOOLS/YAML/stringsource.h

0001 #ifndef STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
0002 #define STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66
0003
0004 #if defined(_MSC_VER) ||                                            \
0005     (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
0006      (__GNUC__ >= 4))  // GCC supports "pragma once" correctly since 3.4
0007 #pragma once
0008 #endif
0009
0010 #include <cstddef>
0011
0012 namespace SHERPA_YAML {
0013 class StringCharSource {
0014  public:
0015   StringCharSource(const char* str, std::size_t size)
0016       : m_str(str), m_size(size), m_offset(0) {}
0017
0018   operator bool() const { return m_offset < m_size; }
0019   char operator[](std::size_t i) const { return m_str[m_offset + i]; }
0020   bool operator!() const { return !static_cast<bool>(*this); }
0021
0022   const StringCharSource operator+(int i) const {
0023     StringCharSource source(*this);
0024     if (static_cast<int>(source.m_offset) + i >= 0)
0025       source.m_offset += i;
0026     else
0027       source.m_offset = 0;
0028     return source;
0029   }
0030
0031   StringCharSource& operator++() {
0032     ++m_offset;
0033     return *this;
0034   }
0035
0036   StringCharSource& operator+=(std::size_t offset) {
0037     m_offset += offset;
0038     return *this;
0039   }
0040
0041  private:
0042   const char* m_str;
0043   std::size_t m_size;
0044   std::size_t m_offset;
0045 };
0046 }
0047
0048 #endif  // STRINGSOURCE_H_62B23520_7C8E_11DE_8A39_0800200C9A66