https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63458
Bug ID: 63458
Summary: myclassobj >> charac compiles without warning, EVEN
though ONLY operator>>(std::string&) exists
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mqi30097 at qoika dot com
Why no warning whatsoever??
//================= go.cpp ======================================
#include <iostream>
class Mystream
{
public:
Mystream(std::istream& is1) : is{is1} {}
Mystream& operator>>(std::string&);
operator bool();
private:
std::istream& is;
};
Mystream& Mystream::operator>>(std::string& s)
{
is >> s;
return *this;
}
Mystream::operator bool()
{
return is.good();
}
int main()
{
Mystream ms(std::cin);
char ch;
while (ms >> ch) { // WHY NO WARNING?
std::cout << ch << '\n';
}
return 0;
}
//================= end of go.cpp ======================================
Compile with:
c++ -std=c++11 -o go go.cpp
To "fix" the program:
Change declaration in main from
char ch;
to
std::string ch;
Why no warning?
Thanks.
