clear() before delete? --hash_map

[newbie]

For STL containers like hash_map, need I explicitly call clear()
before delete()ing it?

e.g.
hash_map<string , MyClass**my_map ;

my_map = new (hash_map<strin g, MyClass*>);

....
....

for(hash_map<My Class*>::iterat or it = my_map->begin() ; it != my_map-

>end(); ++it)

delete it->second;
// do I need call my_map->clear()?
delete my_map;

Thank,

[Mark P]

newbie wrote:

For STL containers like hash_map, need I explicitly call clear()
before delete()ing it?

hash_map is, AFAIK, not yet standard. Nonetheless the answer to your
question is "no".

>
e.g.
hash_map<string , MyClass**my_map ;

my_map = new (hash_map<strin g, MyClass*>);

...
...

for(hash_map<My Class*>::iterat or it = my_map->begin() ; it != my_map-

>end(); ++it)

delete it->second;
// do I need call my_map->clear()?
delete my_map;

Thank,

[red floyd]

newbie wrote:

For STL containers like hash_map, need I explicitly call clear()
before delete()ing it?

e.g.
hash_map<string , MyClass**my_map ;

my_map = new (hash_map<strin g, MyClass*>);

[redacted]

delete my_map;

Any particular reason you're new-ing this, instead of declaring it:

hash_map<string , MyClass*my_map;

In general, you don't need to use new and delete as often as most people
seem to think.

[newbie]

On Mar 27, 8:25 pm, red floyd <no.s...@here.d udewrote:

newbie wrote:

For STL containers like hash_map, need I explicitly call clear()
before delete()ing it?

e.g.
hash_map<string , MyClass**my_map ;

my_map = new (hash_map<strin g, MyClass*>);

[redacted]

delete my_map;

Any particular reason you're new-ing this, instead of declaring it:

hash_map<string , MyClass*my_map;

In general, you don't need to use new and delete as often as most people
seem to think.

does hash_map<string , MyClass*my_map; (which I am not sure how many
byte it needs)
use more memory on stack, suppose the class is initialized as a stack
variable,
than "hash_map<strin g, MyClass**my_map ;" (which is just a pointer)?

Thanks,

[James Kanze]

On Apr 6, 7:45 pm, "newbie" <mitbb...@yahoo .comwrote:

does hash_map<string , MyClass*my_map; (which I am not sure how many
byte it needs)
use more memory on stack, suppose the class is initialized as a stack
variable,
than "hash_map<strin g, MyClass**my_map ;" (which is just a pointer)?

Maybe, but not enough to matter.

--
James Kanze (Gabi Software) email: ja*********@gma il.com
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