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From Konrad Grochowski <>
Subject Re: Thrift C++ library generating locale-specific JSON
Date Tue, 02 Dec 2014 13:19:08 GMT

How it should look (and hopefully work):

char* oldLoc = setlocale(LC_NUMERIC, "C")
std::stirng numberAsString = /* printf/lexical_cast/iostream */;
setlocale(LC_NUMERIC, oldLoc);

Preferably - some RAII construct has to be implemented :)

It's probably only portable solution. But: setlocale can be sloooow, so 
maybe changing it once at begin of generation and restoring at end will 
be needed (local changes are better, yet I don't know what are 
efficiency expectations for code generator).


W dniu 2014-12-02 o 13:35, Randy Abernethy pisze:
> Hello Simon,
> If you create a Jira issue for this bug a Thrift developer (could be
> you or any other interested party) will repair the flaw and you can
> track it through the issue ticket.
> The Boost Lexical cast header is 2,747 lines long and it includes
> 10-15 similar headers. Something simpler here would make a lot of
> sense.
> Best,
> Randy
> On Tue, Dec 2, 2014 at 1:47 AM, Simon Falsig <> wrote:
>> Hi,
>> I'm using Thrift for serializing objects (in C++) into JSON strings, which
>> I then store as files. This usually works fine, but I just discovered that
>> if the locale of my system is set to a locale where the decimal separator
>> is ',' instead of '.' (for instance in Denmark), then the TJSONProtocol
>> (specifically the writeJSONDouble function that does the double to string
>> conversion through a boost::lexical_cast) will also use this separator
>> when serializing doubles. This kinda plays havoc with the JSON
>> specification, which does not allow for localized formatting, and depends
>> on always using '.' as a decimal separator. I could imagine that there may
>> be other more subtle places where the local can have an effect, but this
>> is currently the only place I've been having trouble with.
>> I can see that the same problem has been fixed for C# (commit
>> 3da317bda100130b2f615034c46b0944888f0f14 / THRIFT-1245 C# JSON Protocol
>> uses culture-dependant decimal separator for double) but it doesn't seem
>> as if there's a similarly easy way to fix boost::lexical_cast...
>> In any case, I'm not too strong with respect to all this locale stuff, so
>> if anyone has a quick way to fix this, I'd be very interested.
>> Note that I'm using Thrift 0.9.0, but as far as I can see there hasn't
>> been any relevant changes to TJSONProtocol.cpp since that.
>> Thanks in advance,
>>   - Simon

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