Which constructor is being called?

Two constructors are as follows:

UsbSocket::UsbSocket(unsigned short tId)
: _callTask(tId),
  ...
{
  ...
  ...
}


UsbSocket::UsbSocket(unsigned short rxBuffsize, unsigned short txBuffsize, unsigned short tId)
: _callTask(tId),
  ...
{
 ...
 ....
}


A class is getting instantiated as follows:

UsbSocket *_usb;

_usb = new UsbSocket();


I believe above Two constructors are not getting called.  Is the default constructor getting called?

We work on embedded ARM7 based target.  We used Keil Tools.
If the default constructor is getting called, what does it do?  Do I need to look at the compiler manual to find out what the default constructor does in my system?
LVL 1
naseeamAsked:
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jkrConnect With a Mentor Commented:
If there is no default constructor in the code, a compiler-generated one will be invoked. This one only does a minimum amount of initialization (will depend on the compiler). The best would be if you would provide your own default constructor,
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jkrConnect With a Mentor Commented:
>>I believe above Two constructors are not getting called.  Is the default constructor getting
>>called?

Yes, indeed - only the default constructor matches the argument list (i.e. no arguments at all). Only if the 1st ctor would have a default argulent like 'UsbSocket::UsbSocket(unsigned short tId = 0)', it would match. Since that is not the case, the default constructor is used.
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naseeamAuthor Commented:
What does the default constructor do?  There are so many members in this class.  I need to know what are they getting initialized to.
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naseeamAuthor Commented:
Thanks for explaining  the constructor confusion.
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