Method StringPiece

extern/re2/re2/stringpiece.h:58–59

We provide non-explicit singleton constructors so users can pass in a "const char*" or a "string" wherever a "StringPiece" is expected.

  // in a "const char*" or a "string" wherever a "StringPiece" is
  // expected.
  StringPiece()
      : data_(NULL), size_(0) {}
#if __has_include(<string_view>) && __cplusplus >= 201703L
  StringPiece(const std::string_view& str)
      : data_(str.data()), size_(str.size()) {}