Several questions on C++

Hello

Sorry, I have several questions on C++ instead of any boost library.
But I believe the boost guys could easily give me help. 

1) I found code fragment like this, esp. in macro definitions:

do {      \
          \
// ...    \
} while(0)

Why is the do/while clause needed here?

2) I found large amount of code like this in a class implementation:

AClass::func()
{
	this->func1();
}

Why is 'this->' needed?

Thanks for any help.

B/Rgds
Max

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