weird formattedRead

[frame]

On Friday, 9 April 2021 at 16:11:26 UTC, Oleg B wrote:

> Is space a special char for `formattedRead` and it simple stop 
> parse without throwing exception if not found space (that 
> represented in fmt string)?
> Have `formattedRead` any other special chars?
> Or it's bug?

I think it's a bug:

The char 0x20 is meant to be skipped till end of the string or a 
parseable char in the format string by the function 
readUpToNextSpec().

If the function found a whitespace in the input string, it's fine 
and skipped as long there is another whitespace char. But if the 
input string range is already done, it also does just nothing 
anymore. For other chars if would throw the 'Cannot find 
character' exception.


But the source declared this as "backwards compatibility":

```
string s = " 1.2 3.4 ";
double x, y, z;
assert(formattedRead(s, " %s %s %s ", &x, &y, &z) == 2);
assert(s.empty);
assert(approxEqual(x, 1.2));
assert(approxEqual(y, 3.4));
assert(isNaN(z));
```

So it seems to be a desired behaviour.