https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69944
Bug ID: 69944
Summary: ctype::widen issue, use self-define do_widen, get
unexpected result.
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: derrick at ca dot ibm.com
Target Milestone: ---
I compile the following code under gcc5.2.
$g++ -std=c++11 test.cpp -o test
#include <locale>
#include <codecvt>
#include <stdio.h>
typedef char Mychar;
#include <cctype>
int cnt_;
struct Mycty_ : public std::ctype<Mychar> {
protected:
Mychar do_widen(char c) const
{++cnt_;
return (std::tolower(c)); }
const char *do_widen(const char *first1,
const char *last1,
Mychar *first2) const
{++cnt_;
*first2 = do_tolower(*first1);
return (last1); }
};
int main(int argc, char *argv[])
{
Mycty_ fac;
cnt_ = 0;
if (fac.widen('A')=='a')
printf ("111\n");
if(fac.widen('0')=='0')
printf("222\n");
return 0;
}
I expected it should print 111 and 222. But only 111 is print.
If comment "if (fac.widen('A')=='a')", then 222 can be print.
I suspect if the lib has issue.
