[igraph] How to complete a graph assigning 0 as weight attribute of new edges

[Francesco]

Hello list,

Please consider the following graph

library(igraph)
g <- erdos.renyi.game(100, 2/100)
E(g)$weight <- sample(1:10, ecount(g), replace=TRUE)

I am interested in "completing" the graph by adding all missing edges (as a result each pair of vertices will be connected by an edge) but making sure the new edges are assign E(g)$weight = 0.

Is it possible?

PS: Question also posted here: http://stackoverflow.com/questions/21619566/how-to-complete-a-graph-assigning-0-as-weight-attribute-of-new-edges