Re: [Boost-users] [BGL] Bundled properties and property maps

Andrew Sutton wrote:

On Tue, Jan 13, 2009 at 9:56 AM, Andrew Sutton mailto:andrew.n.sutton@gmail.com> wrote:

Hi Andrew, apologies for writing directly to you, I just thought I'd try to get your attention this way since you hadn't yet replied to my last post on the above topic in the mailing list.

Sorry about that, I've been swamped since new years. I'm going to bounce this back to the list

I would avoid declaring property maps as const. Somewhere in your posted code you have:

const property_map<...>::const_type map; // or something similar.

For all property maps, map = get(...) is a valid expression, regardless of whether your map is a ::type or ::const_type. By declaring it const, and then instantiating a template with the const pmap, you're going to run into problems - probably the problem you reported earlier.

Andrew Sutton andrew.n.sutton@gmail.com

Okay, so if I understand correctly I shouldn't use const prop maps with const_type at all? It seems to me like a line such as the above should still theoretically compile. At least from the perspective of a concept check for Readability; this is by definition what const is meant to restrict objects to so in theory in should be allowable no? If I'm right it would be a compilation error caused by the underlying implementation. Either that or a debatable foible that should be documented? *shrug*. Thanks, Geoff