Re: [Boost-users] How to return a Null pointer for shared_ptr

Subject: Re: [Boost-users] How to return a Null pointer for shared_ptr
From: Shane Baker (sbaker_at_[hidden])
Date: 2009-12-01 21:25:15

IntPtr search(const std::string& key)
{
   IntPtr i;
   MapTable::const_iterator it = mt.find(key);
   if (it != mt.end()) {
        i = it->second; // can't compile it??
   }
   return i;
}

On Tue, Dec 1, 2009 at 8:12 PM, hce <webmail.hce_at_[hidden]> wrote:

> Hi,
>
> I defined a shared_ptr in to a map table. How can I return a NULL
> pointer in a function to search the table if it is not found as
> following example?
>
> typedef shared_ptr<int> IntPtr;
> typedef std::map<std::string IntPtr> MapTable;
>
> MapTable mt;
>
> IntPtr search(const std::string& key)
> {
>    MapTable::const_iterator it = mt.find(key);
>    if (it == mt.end()) {
>         return NULL; // can't compile it??
>    }
>    return it->second;
> }
>
> Thank you.
>
> Kind regards,
>
> Jupiter
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