That was a loooooong and painful discussion during the boost.locale review.
Such a change was asked by the reviewers that wanted to be able to use
wide strings as keys. For example
translate(L"© All Rights Are Reserved")
Where "©" is non-ASCII character.
This change was mostly required to support non-ascii characters in keys.
To be honest I was strongly against the change but finally had to accept it.
See: http://thread.gmane.org/gmane.comp.lib.boost.devel/218543
Also you can search boost lists the locale review comments...
Artyom Beilis
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On Fri, 12/20/13, Alexander Lamaison wrote:
Subject: [boost] [Locale] translate() couples key and output character widths
To: boost@lists.boost.org
Date: Friday, December 20, 2013, 1:01 PM
I've finally gotten round to changing
from the pre-release version of
Boost.Locale (v2.92) to the version now in Boost, and I was
quite
surprised by one change. Previously, I could do the
following:
void function_takes_wide_string(std::wstring message);
function_takes_wide_string(boost::locale::translate("My
translation key"));
However, with the new version, the key must be passed in as
a wide string
if I am to be able to get a wide string out. This
means changing
`translate("blah")` to `translate(L"blah")` throughout.
The change itself is no big deal, but the problem is that it
feels like
a change for the worse. The character width of the key
is now coupled
to the character width of the output, when the two are
separate concepts
and should be allowed to vary independently. The old
class `message`
coeerced the string to whichever width was required.
The new class
`basic_message<T>` coerces only to
`basic_string<T>` and, worse than
that, doesn't provide a method to explicitly convert to a
different
width string.
My question, I suppose, is why was this change made?
What makes the new
API better?
Alex
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