If a constructor throws that means the object failed to initialize and hence it failed to start its existence.
MyClass* lMyObject;
try { lMyObject = new MyClass(); }
catch (std::exception e) { /* Handle constructor exception */ }
In the above if the constructor throws an exception, lMyObject
is left uninitialized, in other words, the pointer contains an indeterminate value.
See classic Constructor Failures for a detailed explanation:
We might summarize the C++ constructor model as follows:
Either:
(a) The constructor returns normally by reaching its end or a return statement, and the object exists.
Or:
(b) The constructor exits by emitting an exception, and the object not only does not now exist, but never existed.
There are no other possibilities.