Re: [Boost-users] ptr_container: ptr_map.insert() not compiling?

--- At Tue, 19 Dec 2006 11:46:40 +0100, Thorsten Ottosen wrote:

Duane Murphy wrote:

...

I'm trying to use boost::ptr_map<> and cannot get calls insert to compile.

I'm on Mac OS X using gcc 3.3 with Xcode.

Even the most basic code fails to compile:

boost::ptr_map< in, int* > my_map; int * val = new int( 22 ); my_map.insert( 1, val );

See http://www.boost.org/libs/ptr_container/doc/ptr_map_adapter.html

The first argument needs to be a reference:

int key = 1; my_map.insert( key, new int(22) );

1.34 adds the followinf overload:

template< class U > std::pair insert( const key_type& key, std::auto_ptr<U> x )

which does allow the key to be an rvalue (just don't create the auto_ptr in the function call).

And here I was assuming it was something to do with the value... Thank you. I now recall reading something about that, but it wasn't clear to me at the time that it was talking about the key. This fixes the problem. ...Duane