C++ - member initializer lists

c++11 feature to initialize public members without using constructor using c1{1, 2};

#include <iostream>

class cls
{
public:
	int x;
	int y;
};

int main()
{
	cls c1{1, 2};
	std::cout << c1.x << " " << c1.y << std::endl;
}

most GNU toolchains support 11 by default. so, it works as expected

$ ./a.out
12

when compiled with std=c++98, it prints

member-class-init.cpp:12:8: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11
  cls c1{1, 2};
        ^