[Boost-users] [String Algo] error in ireplace_first or ireplace_all with std::wstring under gcc 3.4.2 (MingW)

Subject: [Boost-users] [String Algo] error in ireplace_first or ireplace_all with std::wstring under gcc 3.4.2 (MingW)
From: Doug Swanson (dougswanson_at_[hidden])
Date: 2010-01-15 23:20:58

I hope this is the appropriate place to post -- I apologize in advance 
if it is not!

The following code compiles and runs without error under g++ in Windows, 
GCC 3.4.2 (MingW):

<code>

#include <cstdio>
#include <string>
#include <boost/algorithm/string.hpp>

using namespace std;
using namespace boost;

int main( void )
{
    string test = "This is a test";
    ireplace_first( test, "test", "success" );
    printf( "%s\r\n", test.c_str() );
    return 0;
}

</code>

The output is correct:  "This is a success".

If I change the above code to use a std::wstring instead, it will 
compile, but it will crash on execution:

<code>

#include <cstdio>
#include <string>
#include <boost/algorithm/string.hpp>

using namespace std;
using namespace boost;

int main( void )
{
    wstring test = L"This is a test";
    ireplace_first( test, L"test", L"success" );
    printf( "%ws\r\n", test.c_str() );
    return 0;
}

</code>

Setting a breakpoint on std::terminate() in gdb gives the following 
backtrace:

Breakpoint 1, 0x00407ae6 in std::terminate() ()
(gdb) bt
#0  0x00407ae6 in std::terminate() ()
#1  0x00404dc2 in __cxa_throw ()
#2  0x004021d2 in std::__throw_bad_cast() ()
#3  0x00434c69 in std::ctype<wchar_t> const& 
std::use_facet<std::ctype<wchar_t> >(std::locale const&) (__loc=@0x22fe8c)
    at 
C:/Applications/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/locale_facets.tcc:112
#4  0x0043415c in wchar_t std::toupper<wchar_t>(wchar_t, std::locale 
const&) (  __c=84, __loc=@0x22fe8c)
    at 
C:/Applications/Dev-Cpp/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/locale_facets.h:4553
#5  0x0041648c in bool boost::algorithm::is_iequal::operator()<wchar_t, 
wchar_t> (wchar_t const&, wchar_t const&) const (this=0x22fe8c, 
Arg1=@0x3e3df4, Arg2=@0x43702e)
    at C:/Applications/Boost_new/boost/algorithm/string/compare.hpp:71
#6  0x004163fb in 
boost::iterator_range<__gnu_cxx::__normal_iterator<wchar_t*, 
std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > > > 
boost::algorithm::detail::first_finderF<wchar_t const*, 
boost::algorithm::is_iequal>::operator()<__gnu_cxx::__normal_iterator<wchar_t*, 
std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > > >(__gnu_cxx::__normal_iterator<wchar_t*, 
std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > >, __gnu_cxx::__normal_iterator<wchar_t*, 
std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > >) const (this=0x22fe80, Begin={_M_current = 
0x3e3df4}, End={_M_current = 0x3e3e10})    at 
C:/Applications/Boost_new/boost/algorithm/string/detail/finder.hpp:76
#7  0x00413fe8 in void 
boost::algorithm::find_format<std::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> >, 
boost::algorithm::detail::first_finderF<wchar_t const*, 
boost::algorithm::is_iequal>, 
boost::algorithm::detail::const_formatF<boost::iterator_range<wchar_t 
const*> > >(std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> >&, 
boost::algorithm::detail::first_finderF<wchar_t const*, 
boost::algorithm::is_iequal>, 
boost::algorithm::detail::const_formatF<boost::iterator_range<wchar_t 
const*> >) (
    Input=@0x22ff50, Finder=@0x22fe80, Formatter={m_Format = {m_Begin = 
0x43701e, m_End = 0x43702e, singular = false}})
    at C:/Applications/Boost_new/boost/algorithm/string/find_format.hpp:146
#8  0x004141b5 in void 
boost::algorithm::ireplace_first<std::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> >, wchar_t[5], 
wchar_t[8]> (std::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> >&, wchar_t[5] const&, wchar_t[8] const&, 
std::locale const&) (Input=@0x22ff50, Search=@0x43702e, 
Format=@0x43701e, Loc=@0x22ff40)
    at C:/Applications/Boost_new/boost/algorithm/string/replace.hpp:259
#9  0x004014e8 in main () at test.cpp:11

I am not competent enough with Boost to understand what the call stack 
is telling me, except that __throw_bad_cast( ) is the source of the 
crash.  ireplace_all gives the same behavior as ireplace_first above.

Furthermore, the problem does not arise if I use replace_first or 
replace_all instead of ireplace_first or ireplace_all.  It compiles and 
runs correctly.

Finally, the problem does not arise if I compile using MSVC 2008.  It 
compiles and runs correctly.

Does this indicate a problem with gcc (MingW) unicode support?  Is there 
an easy way to circumvent it?

Thank you very much for any suggestions!