What does line 162 do ?

[Rafael Anschau]

159: static PartsList GlobalPartsList ;
160: };
161:
162: PartsList PartsList::Glob alPartsList;

I would understand if it initialized the object
GlobalPartsList with some value, but as it is now, it seems to me
without purpose.

Thanks,

Rafael

[Victor Bazarov]

Rafael Anschau wrote:

159: static PartsList GlobalPartsList ;
160: };
161:
162: PartsList PartsList::Glob alPartsList;

I would understand if it initialized the object
GlobalPartsList with some value, but as it is now, it seems to me
without purpose.

It _defines_ the static data member. Read up on static data members.

V
--
Please remove capital 'A's when replying by e-mail
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[Rafael Anschau]

Yes, my text says it initializes or defines it there. That line 159
only declares it.
But initializes it, defines it with what ? What it does is to make it
possible to later assign
a value ?

[]´s

Rafael

On May 9, 12:26 pm, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:

Rafael Anschau wrote:

159: static PartsList GlobalPartsList ;
160: };
161:
162: PartsList PartsList::Glob alPartsList;

I would understand if it initialized the object
GlobalPartsList with some value, but as it is now, it seems to me
without purpose.

It _defines_ the static data member. Read up on static data members.

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Jim Langston]

On May 9, 12:26 pm, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:

>Rafael Anschau wrote:

>>159: static PartsList GlobalPartsList ;
160: };
161:
162: PartsList PartsList::Glob alPartsList;

>>I would understand if it initialized the object
GlobalPartsLi st with some value, but as it is now, it seems to me
without purpose.

It _defines_ the static data member. Read up on static data members.

Rafael Anschau wrote:

Yes, my text says it initializes or defines it there. That line 159
only declares it.
But initializes it, defines it with what ? What it does is to make it
possible to later assign
a value ?

[]´s

Please do not top post. Message rearranged.

Since GlobalPartsList is static, there can be only one in the program.
There can be only one definition.

Line 162 is simply *the* definition. Line 159 is the declaration. You can
not define a static variable inside a class declaration, you can only
declare it. So outside the class declaration you need the definition, which
you have.

It may make more sense if it was an int.

class foo
{
static int bar;
};

int foo::bar = 42;

Your PartsList PartsList::Glob alPartsList; is doing the same thing, it is
just default constructed.
--
Jim Langston
ta*******@rocke tmail.com

[Rafael Anschau]

Thanks, but same question.

int foo::bar = 42;//OK, =42
int foo::bar; //??

[]´s

Rafael

[Rafael Anschau]

Thanks but same question:

int foo::bar = 42; //Ok, =42
int foo::bar;// ?? =??

[]´s

Rafael

[Victor Bazarov]

Rafael Anschau wrote:

Thanks, but same question.

int foo::bar = 42;//OK, =42
int foo::bar; //??

If your question is what value 'foo::bar' gets, the answer is 0.

[]´s

Sorry, I for one don't understand. "Brackets's "?

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Martin York]

On May 9, 8:43 am, Rafael Anschau <rafael.ansc... @gmail.comwrote :

Yes, my text says it initializes or defines it there. That line 159
only declares it.
But initializes it, defines it with what ? What it does is to make it
possible to later assign
a value ?

When an object is initialised it calls the objects constructor.
So line 162 creates the object and calls the objects constructor (see
constructor for PartsList). Once it has been constructed you can now
call all the public methods available in PartsList.
PartsList::Glob alPartsList.doS omthing()

[Rafael Anschau]

Thank you now I get it. The purpose is to make members avalible
and run the constructor. Great.

[]´s

Rafael

[Rafael Anschau]

>Sorry, I for one don't understand. "Brackets's "?

That´s an old 80´s 90´s (70´s ?) electronic compliment.

[]´s

Rafael