Method len

Source/external/fast_float.h:297–299

  constexpr span() : ptr(nullptr), length(0) {}

  constexpr size_t len() const noexcept {
	return length;
  }

  FASTFLOAT_CONSTEXPR14 const T& operator[](size_t index) const noexcept {
	FASTFLOAT_DEBUG_ASSERT(index < length);