A basic C++ question

[QQ]

Hello, I am new on C++, I am reading one source code
ZThread::ZThrea d(char *threadname):bu g("ZThread")
~~~~~~~~~~~~~~~ ~~~~What does it mean?

Thanks a lot!

{
........
}

[Rolf Magnus]

Re: A basic C++ question

QQ wrote:
[color=blue]
> Hello, I am new on C++, I am reading one source code
> ZThread::ZThrea d(char *threadname):bu g("ZThread")
> ~~~~~~~~~~~~~~~ ~~~~What does it mean?[/color]

Which C++ book are you reading that doesn't explain initializer lists? This
is a very basic concept of C++.
The above means that 'bug' is either the name of a base class of ZThread or
the name of one of its data members. In the former case, the base part of
your object is initialized using its constructor that takes a const char*.
In the latter, the data member is initialized with such a constructor.
Without the initializer, the default constructor would be used.

[Victor Bazarov]

Re: A basic C++ question

QQ wrote:[color=blue]
> Hello, I am new on C++, I am reading one source code
> ZThread::ZThrea d(char *threadname):bu g("ZThread")
> ~~~~~~~~~~~~~~~ ~~~~What does it mean?
>
> Thanks a lot!
>
> {
> .......
> }
>[/color]

It's called "initialise r list" ("initialize r list"). The member
named 'bug' is initialised with a const char[] argument (a string
literal).

V

[eKIK]

Re: A basic C++ question

It means you've got a method called ZThread in a class called ZThread
(constructor) which take a char pointer as argument and sets the value
of the variable bug to "ZThread".

ZThread::ZThrea d(char* threadname)
{
bug = "ZThread";
}

This is just another way of writing the (nearly) exact same thing.

Hope this helps!
// eKIK

[John Dibling]

Re: A basic C++ question

That looks like a constructor initialization list.

</dib>

[Lionel B]

Re: A basic C++ question

"eKIK" <trash@boreios. net> wrote in message news:1116364838 .696039.65520@g 49g2000cwa.goog legroups.com...[color=blue]
> It means you've got a method called ZThread in a class called ZThread
> (constructor) which take a char pointer as argument and sets the value
> of the variable bug to "ZThread".[/color]

not "sets the value"; *initialises* bug with ZThread
[color=blue]
> ZThread::ZThrea d(char* threadname)
> {
> bug = "ZThread";
> }
>
> This is just another way of writing the (nearly) exact same thing.[/color]

Terrible advice... not even "nearly":

1) If bug is declared const it won't compile.

2) If bug is an instance of a class with a constructor taking parameter char* it either won't compile (if bug's class
lacks an assignment operator for char*) or otherwise may not do what you expect it to, since bug's char* constructor
won't be called.

--
Lionel B