Re: [Patch 2/2] Localization problem in regex

[Stefan Schweter]

Am Fri, 23 Aug 2013 17:17:41 +0800
schrieb Tim Shen <timshe...@gmail.com>:

> Inspired by this mail:
> http://gcc.gnu.org/ml/libstdc++/2013-08/msg00131.html
> 
> Thanks!
> 
> 

Hi Tim,

I applied the patch + compiled everything - it's working now! Thanks!

But... I found a problem with .imbue():

int main()
{
        std::setlocale(LC_ALL, "");
        
        std::wstring str2 = L"öäü";
        std::wregex re2;
        re2.imbue(std::locale(""));
        re2.assign(L"([[:lower:]]+)");
        std::wsmatch m2;
        
        std::wsregex_token_iterator end {};
        
        for (std::wsregex_token_iterator p{str2.begin(), str2.end(),
re2, {1}}; p != end; ++p) { std::wcout << *p << std::endl;
        }

        return 0;
}

Works fine! But when there's no imbue() call, a Segmentation
fault occurs.

int main()
{
        std::setlocale(LC_ALL, "");
        
        std::wstring str2 = L"öäü";
        std::wregex re2;
        //re2.imbue(std::locale(""));
        re2.assign(L"([[:lower:]]+)");
        std::wsmatch m2;
        
        std::wsregex_token_iterator end {};
        
        for (std::wsregex_token_iterator p{str2.begin(), str2.end(),
re2, {1}}; p != end; ++p) { std::wcout << *p << std::endl;
        }

        return 0;
}

May be it's better to throw an exception here? Thanks in advance,

Stefan