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

From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-01-30 22:39:09

Gottlob Frege wrote:
> 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));

bool rtnValue = find_if( mylist.begin(), mylist.end(),
    bind(&ListItem::getType, _1) != DEFAULT ) == mylist.end();