On 2011-08-03 08:38, Jonathan M Davis wrote:
On Wednesday 03 August 2011 08:29:09 Jacob Carlborg wrote:
On 2011-08-02 19:51, Jonathan M Davis wrote:
I tried to convert a string into a wchar, but that didn't compile
because of this template constraint:
https://github.com/D-Programming-Language/phobos/blob/master/std/conv.
d#L17 70
Is there a way to convert a string into a wchar?
Does that even make sense? What do you want it to do, convert the first
code point to a wchar and throw if there's more than one character in
the string? That's like asking whether you can covert between a
container of ints and an int. I would never expect std.conv.to to
support that. Not to mention, you shouldn't normally be using char or
wchar by themselves, because they might not be valid code points.
Normally, only dchar should be used when representing an individual
character. If you want this, I'd suggest that you simply do something
like
cast(wchar)str.front
What you're asking for is inherently unsafe as far as unicode goes.
- Jonathan M Davis
I'm working on a serialization library and I intend to support as many
types as possible. So if someone serializes a single wchar I need to be
able to deserialize it. Since the serialized data is represented by a
string, in this case, I need to convert a string containing a single
character to a wchar when deserializing.
Yes, convert the first code point to a wchar and then throw if there's
more the one character in the string.
Well, while it's understandable that you have to cover pretty every possible
case of converting to and from a string with what you're doing, I don't think
that it's at all reasonable to have std.conv.to convert a string to any
character type, let alone one other than dchar. It's almost always a horrible
idea and should _not_ be encouraged. So, I'd advise you to just find a way to
deal with it appropriately in your own code. I think that it would be a very
bad idea for std.conv.to or anything else in Phobos to support such a
conversion.
- Jonathan M Davis
Ok, fair enough.
--
/Jacob Carlborg
