I was going through STL list and I tried to implement the list as type class instead of int or any other data type. Below is the code I tried to compile
#include <iostream>
#include <list>
using namespace std;
class AAA {
public:
int x;
float y;
AAA();
};
AAA::AAA() {
x = 0;
y = 0;
}
int main() {
list<AAA> L;
list<AAA>::iterator it;
AAA obj;
obj.x=2;
obj.y=3.4;
L.push_back(obj);
for (it = L.begin(); it != L.end(); ++it) {
cout << ' ' << *it;
}
cout << endl;
}
But it is giving error in the line:
cout<<' '<<*it;
and the error is
In function 'int main()':
34:13: error: cannot bind 'std::basic_ostream<char>' lvalue to 'std::basic_ostream<char>&&'
In file included from /usr/include/c++/4.9/iostream:39:0,
from 1:
/usr/include/c++/4.9/ostream:602:5: note: initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = AAA]'
operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
^
Actually I want to print the contents of the list using the code above.Can somebody help me in solving this??
You try to output an object of type AAA
to a std::ostream
. To do that, you need to write an overload for operator<<
. Something like this:
std::ostream& operator<< (std::ostream& stream, const AAA& lhs)
{
stream << lhs.x << ',' << lhs.y;
return stream;
}
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