Re: [Boost-users] Question about using Boost::for_each function to set a local variable if a condition is met

From: Gottlob Frege (gottlobfrege_at_[hidden])
Date: 2007-01-30 22:16:23

On 1/30/07, Meryl Silverburgh <silverburgh.meryl_at_[hidden]> wrote:
> Hi,
>
> I am trying to Boost::for_each function to set a local variable if all
> elements in this is DEFAULT type.
>
> Here is my code, but I don't know how to implement the last part of
> the if_then call.
>
>  boolean rtnValue = false;
>

bool rtnValue = true;  // assume true

>  for_each(mylist.begin(), mylist.end(), if_then(
> bind(&ListItem::getType, _1) == DEFAULT,  set the local value to true
> if true if all of them are DEFAULT type ));
>
bind(&ListItem::getType, _1) != DEFAULT, set the local value to false));

> if you can give me some pointers, I will be appreciated.
>

ie start with true, set it to false if any are NOT the default.  Not
sure how to bind that though - probably need 'boost::ref(rtnValue) =
false' or something like that.

> Thank you.

HTH,
Tony