The following was asked on comp.lang.c++;
It compiles and crashes with no error/warning on gcc 8.2.1:
#include <iostream>
#include <string>
int main()
{
std::string s1 { s1 };
std::string s2(s2);
std::string s3 = s3;
std::cout << s1 << s2 << s3;
}
[tmp]$ g++ -Wall selfref.cc && ./a.out
Segmentation fault (core dumped)
[tmp]$
On the other hand:
#include <iostream>
int main()
{
int n { n };
std::cout << n << std::endl;
}
[tmp]$ g++ -Wall selfint.cc && ./a.out
selfint.cc: In function ‘int main()’:
selfint.cc:5:7: warning: ‘n’ is used uninitialized in this function
[-Wuninitialized]
int n { n };
^
0
[tmp]$
I wonder why int triggers the warning, but std::string does not.
