[LLVMbugs] [Bug 22213] New: basic_regex::assign breaks *this if it throws regex_error

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22213

            Bug ID: 22213
           Summary: basic_regex::assign breaks *this if it throws
                    regex_error
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kariya_mitsuru at hotmail.com
                CC: llvmbugs at cs.uiuc.edu, mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 13681
  --> http://llvm.org/bugs/attachment.cgi?id=13681&action=edit
clang++ -v

The sample code below should output "true\ntrue\n" but it outputs
"true\nfalse\n" if it is compiled by clang 3.6.0.

=============================== sample code ===============================
#include <iostream>
#include <string>
#include <regex>

int main()
{
    static const char s[] = "abc";
    std::regex re("abc");
    try {
        re.assign(std::string("(def"), std::regex_constants::ECMAScript);
    } catch (const std::regex_error& e) {
        std::cout << std::boolalpha <<
            (e.code() == std::regex_constants::error_paren) << std::endl;
    }
    std::cout << std::boolalpha << std::regex_search(s, re) << std::endl;
}
===========================================================================

================================= output ==================================
true
false
===========================================================================

cf. http://melpon.org/wandbox/permlink/r2GhrrkaKfGZGnd8


The C++11 standard 28.8.3[re.regex.assign]/p.15 says, "If an exception is
thrown, *this is unchanged."

So I think that the output should be

================================= output ==================================
true
true
===========================================================================

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