Method ReadDoubleValue

IO/Geometry/vtkOpenFOAMReader.cxx:2768–2867

reading a double value from a string

// reading a double value from a string
double vtkFoamFile::ReadDoubleValue()
{
  int c;
  // Skip whitespace, update line numbers, and handle newlines.
  while (std::isspace(c = this->Getc()))
  {
    if (c == '\n')
    {
      ++this->Superclass::LineNumber;
#if VTK_FOAMFILE_RECOGNIZE_LINEHEAD
      this->Superclass::WasNewline = true;
#endif
    }
  }
  if (c == '/')
  {
    this->PutBack(c);
    c = this->NextTokenHead();
  }

  // Prepare token accumulation.
  size_t size = 0;
  std::array<char, 1024> buffer;

  // Optional leading sign.
  if (c == '-' || c == '+')
  {
    buffer[size++] = static_cast<char>(c);
    c = this->Getc();
    if (c == '\n')
    {
      ++this->Superclass::LineNumber;
#if VTK_FOAMFILE_RECOGNIZE_LINEHEAD
      this->Superclass::WasNewline = true;
#endif
    }
  }

  // The first character must be a digit or a decimal point.
  if (!std::isdigit(c) && c != '.') // Attention: isdigit() accepts EOF
  {
    this->ThrowUnexpectedNondigitException(c);
  }

  // Read integer part (before '.').
  if (c != '.')
  {
    // Accumulate the first digit.
    buffer[size++] = static_cast<char>(c);
    while (std::isdigit(c = this->Getc()))
    {
      buffer[size++] = static_cast<char>(c);
    }
  }

  // Read decimal part (after '.').
  if (c == '.')
  {