std::regex: inserting std::wregex to std::vector loses some std::wregex values

[Stefan Schweter]

Hi,

using GCC 4.9.1 it can reproduce a strange behavior with inserting
std::wregex values to a std::vector.

I'm using a loop which creates some std::wregex with imbuing and assigning.

After compiling and executing the program code, a core dump is returned.
Having a deeper look with gdb into the std::vector I can see, that only
the half of the std::wregex values have been properly inserted -> see
the _M_original_str variable.

Here is my code to reproduce the error:

#include <regex>
#include <vector>

int main()
{
  std::setlocale(LC_ALL, "");

  std::wstring current_token(L"II.");

  std::vector<std::wregex> regex_vector;

  for (int i = 0; i < 4; ++i)
  {
    std::regex_constants::syntax_option_type flag;
    flag = std::regex_constants::icase;

    std::wregex reg;
    reg.imbue(std::locale(""));

reg.assign(L"^(M*(?:CM|DC{1,3}|D|CD|C{1,3}){0,1}(?:XC|LX{1,3}|L|XL|X{1,3}){0,1}(?:IX|VI{0,3}|IV|I{1,3}){0,1}\\.)$",
flag);

    regex_vector.emplace_back(reg);
  }

  for (auto cit = regex_vector.cbegin(); cit != regex_vector.cend(); ++cit)
  {
    std::wstring::const_iterator it1 = current_token.begin();
    std::wstring::const_iterator it2 = current_token.end();
    std::wsmatch current_token_match;

    std::regex_match(it1, it2, current_token_match, *cit);
  }

  return 0;
}

Compiled with g++ -g -std=c++11 std_regex.cpp.

For the gdb regex_vector output, see attachment.

Is this error known?

Thank you very much in advance + regards,

Stefan




-------------- next part --------------
(gdb) p regex_vector
$1 = std::vector of length 4, capacity 4 = {{static icase = <optimized out>, static nosubs = <optimized out>, 
    static optimize = <optimized out>, static collate = <optimized out>, static ECMAScript = <optimized out>, 
    static basic = <optimized out>, static extended = <optimized out>, static awk = <optimized out>, 
    static grep = <optimized out>, static egrep = <optimized out>, _M_flags = std::regex_constants::icase, _M_traits = {
      _M_locale = {static none = 0, static ctype = 1, static numeric = 2, static collate = 4, static time = 8, 
        static monetary = 16, static messages = 32, static all = 63, _M_impl = 0x631040, static _S_classic = <optimized out>, 
        static _S_global = <optimized out>, static _S_categories = <optimized out>, static _S_once = <optimized out>}}, 
    _M_original_str = L"", _M_automaton = std::shared_ptr (count 1, weak 0) 0x65ac50}, {static icase = <optimized out>, 
    static nosubs = <optimized out>, static optimize = <optimized out>, static collate = <optimized out>, 
    static ECMAScript = <optimized out>, static basic = <optimized out>, static extended = <optimized out>, 
    static awk = <optimized out>, static grep = <optimized out>, static egrep = <optimized out>, 
    _M_flags = std::regex_constants::icase, _M_traits = {_M_locale = {static none = 0, static ctype = 1, static numeric = 2, 
        static collate = 4, static time = 8, static monetary = 16, static messages = 32, static all = 63, _M_impl = 0x659ea0, 
        static _S_classic = <optimized out>, static _S_global = <optimized out>, static _S_categories = <optimized out>, 
        static _S_once = <optimized out>}}, _M_original_str = L"", _M_automaton = std::shared_ptr (count 1, weak 0) 0x65d350}, {
    static icase = <optimized out>, static nosubs = <optimized out>, static optimize = <optimized out>, 
    static collate = <optimized out>, static ECMAScript = <optimized out>, static basic = <optimized out>, 
    static extended = <optimized out>, static awk = <optimized out>, static grep = <optimized out>, 
    static egrep = <optimized out>, _M_flags = std::regex_constants::icase, _M_traits = {_M_locale = {static none = 0, 
        static ctype = 1, static numeric = 2, static collate = 4, static time = 8, static monetary = 16, static messages = 32, 
        static all = 63, _M_impl = 0x659990, static _S_classic = <optimized out>, static _S_global = <optimized out>, 
        static _S_categories = <optimized out>, static _S_once = <optimized out>}}, 
    _M_original_str = L"^(M*(?:CM|DC{1,3}|D|CD|C{1,3}){0,1}(?:XC|LX{1,3}|L|XL|X{1,3}){0,1}(?:IX|VI{0,3}|IV|I{1,3}){0,1}\\.)$", 
    _M_automaton = std::shared_ptr (count 1, weak 0) 0x66b410}, {static icase = <optimized out>, 
    static nosubs = <optimized out>, static optimize = <optimized out>, static collate = <optimized out>, 
    static ECMAScript = <optimized out>, static basic = <optimized out>, static extended = <optimized out>, 
    static awk = <optimized out>, static grep = <optimized out>, static egrep = <optimized out>, 
    _M_flags = std::regex_constants::icase, _M_traits = {_M_locale = {static none = 0, static ctype = 1, static numeric = 2, 
        static collate = 4, static time = 8, static monetary = 16, static messages = 32, static all = 63, _M_impl = 0x665010, 
        static _S_classic = <optimized out>, static _S_global = <optimized out>, static _S_categories = <optimized out>, 
        static _S_once = <optimized out>}}, 
    _M_original_str = L"^(M*(?:CM|DC{1,3}|D|CD|C{1,3}){0,1}(?:XC|LX{1,3}|L|XL|X{1,3}){0,1}(?:IX|VI{0,3}|IV|I{1,3}){0,1}\\.)$", 
    _M_automaton = std::shared_ptr (count 1, weak 0) 0x66c7e0}}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: std_regex.cpp
Type: text/x-c++src
Size: 842 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20140907/c3e25728/attachment.bin>