Why does clang++ destroy only one foo object?

Question

I have the following example code:

#include <iostream> using namespace std;  struct foo {     foo()  { cout << "foo constructed.\n"; }     ~foo() { cout << "foo destroyed.\n"; } };  struct bar {     bar(foo t=foo{}) { } };  int main(int argc, char **argv) {     bar X[2]{};     return 0; } 

When I compile it with clang++ -std=c++11 test.cc, the program produces the following output:

foo constructed. foo constructed. foo destroyed. 

but I expected an additional "foo destroyed." between the two "foo constructed." lines. Why is only one foo destroyed? This happens with clang 3.5.1 as well as 3.6.0.

Answer 1

Thanks for all the people who tested it! This seems to be a bug in clang. I'd appreciate if someone reports it to llvm.org. My few bugs reports there were, let say, not really helpful, so I am not looking to repeat that experience.