[BGL] bundled properties and forward declarations (changes from 1.42 -> 1.46.1 ?)
I have code using bundled properties roughly like this that compiles with boost 1.42: struct EdgeProperty; typedef adjacency_list< ... , EdgeProperty , ...> MyGraph; typedef graph_traits<MyGraph>::edge_descriptor Edge; struct EdgeProperty { Edge next; }; When trying to compile this with boost 1.46.1 I get "error: forward declaration of EdgeProperty’". I am not sure why. The obvious solution would be to move the definition of EdgeProperty before the MyGraph typedef, but then I run into a circular dependency problem as I want to store an edge_descriptor in EdgeProperty. any ideas? Anders
Here is an example:
http://codepad.org/66RTChdX
(the cmake file I use is here: http://codepad.org/NRpRDwsP)
this compiles with gcc 4.5.2 and boost 1.42,
but does NOT compile with gcc 4.6.1 and boost 1.46.1, giving me an error:
"/usr/include/boost/pending/detail/property.hpp:27:18: error: ‘struct
boost::property
I have code using bundled properties roughly like this that compiles with boost 1.42: struct EdgeProperty; typedef adjacency_list< ... , EdgeProperty , ...> MyGraph; typedef graph_traits<MyGraph>::edge_descriptor Edge;
struct EdgeProperty { Edge next; };
When trying to compile this with boost 1.46.1 I get "error: forward declaration of EdgeProperty’". I am not sure why. The obvious solution would be to move the definition of EdgeProperty before the MyGraph typedef, but then I run into a circular dependency problem as I want to store an edge_descriptor in EdgeProperty.
any ideas?
Anders
On Wed, 10 Aug 2011, Anders Wallin wrote:
I have code using bundled properties roughly like this that compiles with boost 1.42: struct EdgeProperty; typedef adjacency_list< ... , EdgeProperty , ...> MyGraph; typedef graph_traits<MyGraph>::edge_descriptor Edge;
struct EdgeProperty { Edge next; };
When trying to compile this with boost 1.46.1 I get "error: forward declaration of EdgeProperty’". I am not sure why. The obvious solution would be to move the definition of EdgeProperty before the MyGraph typedef, but then I run into a circular dependency problem as I want to store an edge_descriptor in EdgeProperty.
Look at my answer to URL:http://stackoverflow.com/questions/4232409/how-to-solve-boostbgl-templat...; it shows how to use bundled properties that contain vertices and edges from the graph being created. -- Jeremiah Willcock
Thanks for the quick reply! I got it working. Here's an updated minimal example: http://codepad.org/box2eNMe AW
Look at my answer to URL:http://stackoverflow.com/questions/4232409/how-to-solve-boostbgl-templat...; it shows how to use bundled properties that contain vertices and edges from the graph being created.
-- Jeremiah Willcock _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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