http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51288
Bug #: 51288
Summary: get_money implementation is missing the sentry object
(does not skip leading whitespace)
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: libstdc++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: cu...@cubbi.org
The I/O manipulator std::get_money, as implemented so far, fails to skip
leading whitespace:
#include <iostream>
#include <sstream>
#include <locale>
#include <iomanip>
int main()
{
std::string str = " $1.23";
std::istringstream s1(str);
try {
s1.imbue(std::locale("en_US.UTF-8"));
long double val;
s1 >> std::get_money(val);
if(s1)
std::cout << val << '\n';
else
std::cout << "Bug\n";
} catch(...) {
std::cout << "Missing locale en_US.UTF-8, cannot run this test\n";
}
}
g++ 4.7.0 20111105 output:
Bug
clang++ 2.9/libc++-svn output:
123
The cause:
GCC implementation of operator>>(basic_istream<_CharT, _Traits>& __is,
_Get_money<_MoneyT> __f) calls __mg.get right away, but the standard says
§27.7.5/1
"The expression in >> get_money(mon, intl) described below behaves as a
formatted input function (27.7.2.2.1)."
§27.7.2.2.1/1
"Each formatted input function begins execution by constructing an object of
class sentry with the noskipws (second) argument false."
