[Boost-users] [BGL] grid_graph, vertex_index and shared_ptr

Subject: [Boost-users] [BGL] grid_graph, vertex_index and shared_ptr
From: Sergey Mitsyn (svm_at_[hidden])
Date: 2012-06-20 10:53:47

Hello,

Recently I've found that the vertex_index property map of grid_graph 
holds a shared_ptr to a graph copy. Is there any reason for it?

Actually, other classes which are tied with grid_graph holds it by plain 
pointer. Switching to it in grid_graph_index_map almost doubled the 
performance on some of my algorithms. Even copying the graph object by 
value (which actually holds 5 fields with 3 being small boost::array) 
still has better performance than using shared_ptr.

Maybe it should be switched to plain pointer?

-- 
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Sergey Mitsyn.