[gecode-users] 2-stage optimisation

[benoitlaurent at neuf.fr]

Hello,
I would like to realize a 2-stage optimisation. More precisely, a first phase using a branch-and-bound algorithm provides me with an upper bound that is used to constrain the second phase. 
My question is the following: do I have to declare two spaces and two engines to achieve this or is there a better way of doing ?
Thanks in advance.
Benoît Laurent
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