POD

[Wolfgang Jeltsch]

Hello,

currently, I use a C++ Draft Standard from the end of 1996. It often speaks
about POD types but unfortunately I cannot find a definition of this term.
What does it mean?

Wolfgang

[Unforgiven]

Re: POD

Wolfgang Jeltsch wrote:[color=blue]
> Hello,
>
> currently, I use a C++ Draft Standard from the end of 1996. It often
> speaks about POD types but unfortunately I cannot find a definition
> of this term. What does it mean?[/color]

POD stands for "Plain Old Data". A POD type is either a scalar (int, double,
whatever) or a simple class or struct with only other POD types and simple
member functions. Do a google search on Plain Old Data and you'll find more
concise definitions of what is and is not a POD type.

--
Unforgiven

"Most people make generalisations "
Freek de Jonge

[Stephen Howe]

Re: POD

> currently, I use a C++ Draft Standard from the end of 1996. It often
speaks[color=blue]
> about POD types but unfortunately I cannot find a definition of this term.
> What does it mean?[/color]

Plain Old Data.

This struct

struct structtag
{
int x;
int y;
};

has no constructor, destructor, copy constructor, member functions. You
could, with the right C compiler, pass it to a C API.

Stephen Howe

[Alexander Terekhov]

Re: POD


Wolfgang Jeltsch wrote:
[...][color=blue]
> What does it mean?[/color]

Same thing as POF, but for data.

regards,
alexander.

[Alexander Terekhov]

Re: POD


Unforgiven wrote:

[snip blah-blah-blah]

http://www.comeaucomputing.com/techtalk/#pod

(What's this "POD" thing in C++ I keep hearing about?)

regards,
alexander.

[Alexander Terekhov]

Re: POD


Stephen Howe wrote:
[...][color=blue]
> has no constructor, destructor, copy constructor, member functions. You
> could, with the right C compiler, pass it to a C API.[/color]

FYI, <http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1356.html>.

regards,
alexander.

[Russell Hanneken]

Re: POD

"Wolfgang Jeltsch" <jeltsch@tu-cottbus.de> wrote in message
news:bj5qhl$fhv f3$1@ID-77306.news.uni-berlin.de...[color=blue]
>
> currently, I use a C++ Draft Standard from the end of 1996. It often
> speaks about POD types but unfortunately I cannot find a definition of
> this term. What does it mean?[/color]

From the C++ standard:

"An aggregate is an array or a class with no user-declared constructors, no
private or protected non-static data members, no base classes, and no
virtual functions" (section 8.5.1, paragraph 1).

"A POD-struct is an aggregate class that has no non-static data members of
type pointer to member, non-POD-struct, non-POD-union (or array of such
types) or reference, and has no user-defined copy assignment operator and no
user-defined destructor. Similarly, a POD-union is an aggregate union that
has no non-static data members of type pointer to member, non-POD-struct,
non-POD-union (or array of such types) or reference, and has no user-defined
copy assignment operator and no user-defined destructor. A POD class is a
class that is either a POD-struct or a POD-union" (section 9, paragraph 4).

"Arithmetic types, enumeration types, pointer types, and pointer to member
types, and cv-qualified versions of these types are collectively called
scalar types. Scalar types, POD-struct types, POD-union types, arrays of
such types and cv-qualified versions of these types are collectively called
POD types" (section 3.9, paragraph 10).

--
Russell Hanneken
rhanneken@pobox .com

[llewelly]

Re: POD

Wolfgang Jeltsch <jeltsch@tu-cottbus.de> writes:
[color=blue]
> Hello,
>
> currently, I use a C++ Draft Standard from the end of 1996. It often speaks
> about POD types but unfortunately I cannot find a definition of this term.
> What does it mean?[/color]

See this thread in a related group:

http://groups.google.com/groups?threadm=86wuctbv5p.fsf@Zorthluthik.local.bar

(my post)

[Shane Beasley]

Re: POD

Wolfgang Jeltsch <jeltsch@tu-cottbus.de> wrote in message news:<bj5qhl$fh vf3$1@ID-77306.news.uni-berlin.de>...
[color=blue]
> currently, I use a C++ Draft Standard from the end of 1996. It often speaks
> about POD types but unfortunately I cannot find a definition of this term.
> What does it mean?[/color]

The URL

<http://www.everything2 .com/index.pl?node_i d=1245318>

has a decent description of what it means, both literally (its
definition) and practically (what you can do with it).

- Shane