Python is an example of a language that works like this. When the constructor throws, 'out' remains not defined, but you can just do 'out = ...' in the catch block and define one with a fallback value. So all the code after the error handing would just see a working 'out' variable. This works due to all variables being bound to the function scope, not to the code block, in Python.
* it's not an error to have an unbound name in scope; just referencing it at runtime is an error.
* there is a reasonable default; anything can be set to None
This doesn't hold in C++. If your class throws during its initialization, you can't really do much (even default initialization of members may not work). Reassignment may not be possible if it was declared const.
And there's still the issue of 'which objects successfully initialized'?
