Re: initialization within constructor
rona wrote:
Victor Bazarov wrote:
rona wrote:
Could someone tell us why the below code compiles and works?
Probably because it's well-formed...
Is it
legal in the constructor of class B?
Yes, why do you ask? What throws you off?
Couple of reasons:
1- I knew using a constructor initializer list was the best option.
Eckel's book sounded as if it was the ONLY option. My mistake.
No big deal. Happy to help.
2- Still confused about what happens to the initial storage allocated
to the member ma. When ma is first declared within the class
definition for B, is memory allocated to ma. If yes, what happens to
this memory after "ma = a(xx);" ?
Memory stays where it is. You have a default c-tor in 'a' which leaves
the 'x' member uninitialised. Just before this statement, 'ma.x' has
indeterminate value (you can examine it in the debugger). Here, two
things happen: a temporary is constructed with 'xx' as the constructor
argument, and the [compiler-generated] assignment operator is called
which invokes the assignment semantics on all members, which for you
means 'ma.x = sometemporaryobject.x'
[..]
V
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