[boost] Re: Problem with shared_ptr

From: Greg Colvin (gcolvin_at_[hidden])
Date: 2000-03-15 23:52:35

The compiler is looking for an operator<, which shared_ptr
doesn't have.  It does have a less functor, which you should
be able to supply as a further template argument.

----- Original Message ----- 
From: Paul Jensen <pdjensen_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Wednesday, March 15, 2000 1:30 PM
Subject: [boost] Problem with shared_ptr

> I've been trying to understand why I cannot use shared_ptr in a set. The
> environment is VC++5.0 with <memory> modified for the current version of
> auto_ptr. Here's the code which draws 6 errors like:
> 
> C:\Program Files\DevStudio\VC\INCLUDE\functional(81) : error C2784: 'bool
> __cdecl std::operator <(const class
> std::multiset<`template-parameter-1',`template-parameter-2',`template-parameter-3'>
> &,const class
> std::multiset<`template-parameter-1',`template-parameter-2',`template-parameter-3'>
> &)' : could not deduce template argument for 'const class
> std::multiset<`template-parameter-1',`template-parameter-2',`template-parameter-3'>
> &' from 'const class boost::shared_ptr<int>'
> 
> 
> #pragma warning (disable:4786)
> 
> #include <memory>
> #include <boost/smart_ptr.hpp>
> #include <set>
> 
> using boost::shared_ptr;
> using namespace std;
> 
> int main(int argc, char *argv[]) {
> set< shared_ptr<int> > msgSet;
> msgSet.insert( shared_ptr<int>( new int(8) ) );
> }
> 
> Thanks,
> Paul
> -- 
> Paul Jensen Agile Image Movers http://agileimage.com
> 
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