Function cmCatViews

Source/cmStringAlgorithms.cxx:141–182

}

std::string cmCatViews(
  std::initializer_list<std::pair<cm::string_view, std::string*>> views)
{
  std::size_t totalSize = 0;
  std::string* rvalueString = nullptr;
  std::size_t rvalueStringLength = 0;
  std::size_t rvalueStringOffset = 0;
  for (auto const& view : views) {
    // Find the rvalue string with the largest capacity.
    if (view.second &&
        (!rvalueString ||
         view.second->capacity() > rvalueString->capacity())) {
      rvalueString = view.second;
      rvalueStringLength = rvalueString->length();
      rvalueStringOffset = totalSize;
    }
    totalSize += view.first.size();
  }

  std::string result;
  std::string::size_type initialLen = 0;
  if (rvalueString && rvalueString->capacity() >= totalSize) {
    result = std::move(*rvalueString);
  } else {
    rvalueString = nullptr;
  }
  result.resize(totalSize);
  if (rvalueString && rvalueStringOffset > 0) {
    std::copy_backward(result.begin(), result.begin() + rvalueStringLength,
                       result.begin() + rvalueStringOffset +
                         rvalueStringLength);
  }
  std::string::iterator sit = result.begin() + initialLen;
  for (auto const& view : views) {
    if (rvalueString && view.second == rvalueString) {
      sit += rvalueStringLength;
    } else {
      sit = std::copy_n(view.first.data(), view.first.size(), sit);
    }
  }
  return result;
}

bool cmStrToLong(char const* str, long* value)
{