[Boost-bugs] [Boost C++ Libraries] #13366: lexical_cast throws std::bad_cast

Subject: [Boost-bugs] [Boost C++ Libraries] #13366: lexical_cast throws std::bad_cast
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-12-26 04:58:16

#13366: lexical_cast throws std::bad_cast
--------------------------------+-----------------------------
 Reporter:  amitkumar.sachan@…  |      Owner:  Antony Polukhin
     Type:  Bugs                |     Status:  new
Milestone:  To Be Determined    |  Component:  lexical_cast
  Version:  Boost 1.64.0        |   Severity:  Regression
 Keywords:                      |
--------------------------------+-----------------------------
 lexical_cast always throws std::bad_cast exception while converting values
 of type  std::basic_string<char, ci_char_traits>  (where ci_char_traits is
 derived from std::char_traits<char>) to double on Linux. It works on
 windows though(i.e. throws boost::bad_lexcial_cast exception for bad
 values, and returns double for valid values). It also works on Linux with
 boost 1.57. I noticed there has been a change in lexical_cast
 implementation that causes this issue now. std::bad_cast exception is
 thrown here because locale associated with the stream does not has
 std::num_get<char, std::istreambuf_iterator<char, ci_char_traits> > >
 facet as shown in the stack trace below. It works with std::string
 (std::basic_string<char, std::char_traits<char>) >  ) because locale has
 std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char>>
 > facet.

 #0  __cxxabiv1::__cxa_throw (obj=0x60b0c0, tinfo=0x60a3f0
 <_ZTISt8bad_cast@@GLIBCXX_3.4>,
     dest=0x2aaaaab092e0 <std::bad_cast::~bad_cast()>)
     at ../../../../gcc-4.8.1/libstdc++-v3/libsupc++/eh_throw.cc:71
 #1  0x00002aaaaab5fb62 in std::__throw_bad_cast ()
     at ../../../../../gcc-4.8.1/libstdc++-v3/src/c++11/functexcept.cc:56
 #2  0x00000000004051bc in std::__check_facet<std::num_get<char,
 std::istreambuf_iterator<char, ci_char_traits> > > (__f=0x0) at
 /xxxx/xxxx/xxxx/gcc-4.8.1/include/c++/4.8.1/bits/basic_ios.h:49
 #3  0x0000000000404b3f in std::basic_istream<char,
 ci_char_traits>::_M_extract<double> (this=0x7fffffffe000,
     __v=@0x7fffffffe228: 0) at
 /xxxx/xxxx/xxxx/gcc-4.8.1/include/c++/4.8.1/bits/istream.tcc:95
 #4  0x0000000000404397 in std::basic_istream<char,
 ci_char_traits>::operator>> (this=0x7fffffffe000,
     __f=@0x7fffffffe228: 0) at
 /xxxx/xxxx/xxxx/gcc-4.8.1/include/c++/4.8.1/istream:219
 #5  0x0000000000403b84 in boost::detail::lexical_ostream_limited_src<char,
 ci_char_traits>::shr_using_base_class<double> (this=0x7fffffffe1a0,
 output=@0x7fffffffe228: 0)
     at
 /xxxx/xxxx/xxxx/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:600
 #6  0x0000000000403503 in boost::detail::lexical_ostream_limited_src<char,
 ci_char_traits>::float_types_converter_internal<double>
 (this=0x7fffffffe1a0, output=@0x7fffffffe228: 0)
     at
 /xxxx/xxxx/xxxx/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:744
 #7  0x0000000000403145 in boost::detail::lexical_ostream_limited_src<char,
 ci_char_traits>::operator>> (
     this=0x7fffffffe1a0, output=@0x7fffffffe228: 0)
     at
 /xxxx/xxxx/xxxx/include/boost/lexical_cast/detail/converter_lexical_streams.hpp:770
 #8  0x0000000000402cce in boost::detail::lexical_converter_impl<double,
 std::basic_string<char, ci_char_traits, std::allocator<char> >
 >::try_convert (arg=..., result=@0x7fffffffe228: 0)
     at
 /xxxx/xxxx/xxxx/include/boost/lexical_cast/detail/converter_lexical.hpp:485
 #9  0x0000000000402a32 in
 boost::conversion::detail::try_lexical_convert<double,
 std::basic_string<char, ci_char_traits, std::allocator<char> > > (arg=...,
 result=@0x7fffffffe228: 0)
     at
 /xxxx/xxxx/xxxx/include/boost/lexical_cast/try_lexical_convert.hpp:196
 #10 0x00000000004027be in boost::lexical_cast<double,
 std::basic_string<char, ci_char_traits, std::allocator<char> > > (arg=...)
 at /xxxx/xxxx/xxxx/include/boost/lexical_cast.hpp:41
 #11 0x0000000000401d7f in lexicalcast (mystr=...) at
 lexicalcast_test.cpp:14
 #12 0x0000000000401f0d in main () at lexicalcast_test.cpp:39

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13366>
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