Re: [boost] [convert] coversion between strings with differentlocales

9 Jul 2009

      Hi,
----- Original Message ----- 
From: "Vladimir Batov" <batov@people.net.au>
To: <boost@lists.boost.org>
Sent: Thursday, July 09, 2009 10:13 AM
Subject: Re: [boost] [convert] coversion between strings with differentlocales
...
...
From: "vicente.botet" <vicente.botet@wanadoo.fr>
I wanted to see how we can convert a double from a locale to another 
locale?
...
OTOH, I'd say
string en_double = ...;
double d = convert<double>::from(en_str)(locale_=en_locale);
string fr_double = convert<string>::from(d)(locale_=fr_locale);
If you want to stitch it all together, it becomes a scary
string fr_double =
   convert<string>::from(
       convert<double>::from(en_str)(locale_=en_locale).value()
   )(locale_=fr_locale);
or as scary
string fr_double =
   convert<string>::from<string>(
       convert<double>::from(en_str)(locale_=en_locale)
   )(locale_=fr_locale);
you mean 

string fr_double =
    convert<string>::from<***double***>(
        convert<double>::from(en_str)(locale_=en_locale)
    )(locale_=fr_locale);
...
If needed, I'd probably wrap it up in a function like
template<class T>
T convert(T const&, locale const&, locale const&);
There is something missing in this function. The intermediary class.

Anyway I don't think we need a specific function for this specific case. I would prefer to qualify the string class be converted with formatting specifics.

string fr_double = convert_to_using<fr_locale<string>, double>::from(en_locale(en_str));

which can be readen as convert from a string representing a double with the english locale to a string with a french locale.

Best,
Vicente