What does this syntax mean?
 

Hi, the following piece of code is rather obscure for me

struct Foo
{
Foo( int _x ) : x(_x) {}
....
};

what's the meaning of that construct? I understand Foo() must be a
constructor, right? But then what's with the syntax after the ":" ??

Thanks!
Giuseppe

Re: What does this syntax mean?
 

Giuseppe:G: wrote:
> Hi, the following piece of code is rather obscure for me
>
> struct Foo
> {
> Foo( int _x ) : x(_x) {}
> ....
> };
>
> what's the meaning of that construct? I understand Foo() must be a
> constructor, right? But then what's with the syntax after the ":" ??
>
Look up initialiser lists.

--
Ian Collins.

Re: What does this syntax mean?
 

On Sun, 22 Jun 2008 21:02:45 +0200, G: <giuseppegalloneNO@spamgmail.com>
wrote:

> Hi, the following piece of code is rather obscure for me
>
> struct Foo
> {
> Foo( int _x ) : x(_x) {}
> ...
> };
>
> what's the meaning of that construct? I understand Foo() must be a
> constructor, right? But then what's with the syntax after the ":" ??
>
> Thanks!
> Giuseppe

Search "initialization lists" on google.

Re: What does this syntax mean?
 

Giuseppe:G: <giuseppegalloneNO@SPAMgmail.com> wrote:

>Hi, the following piece of code is rather obscure for me
>
>struct Foo
>{
> Foo( int _x ) : x(_x) {}
>...
>};

Foo takes an integer argument. the :x(_x) says to initialize the
member variable x using the argument _x. "{}" says that the body of
the method is empty, that is, the initialization is the only thing
that the constructor does.

--
Tim Slattery
Slattery_T@bls.gov
http://members.cox.net/slatteryt