Default Initialization Versus Zero Initialization

Question

I cannot understand the behavior of gcc 4.8.1 or Visual Studio 2015 with respect to default initialization versus value initialization.

It doesn\'t help that I\'m tr

Answer 1

The logic is quite simple:

1. Default initialization of a class just default initializes all members.
2. Default initialization of built-in types leaves member uninitialized.
3. Accessing an uninitialized object yields undefined behavior.
4. Undefined behavior can do anything it wants.
5. Both compilers provide "correct" results. Note that causing nasal demons to be emitted would also be correct.