[Cbc] wrapper to create matrix via variables/constraints (not rows/columns)

[Felix Brandt]

Dear all,

I'm looking for a way to describe the constraints of a CBC model in a 
more natural way than by using row/column indices. Gurobi has a simple 
API where vars and constraints can be specified directly, looking like 
the following:

Model model;
Variable var1 = model.addVar();
Variable var2 = model.addVar();
model.addConstr (2 * var1 + var2 <= 5);

I wonder if something similar exists for CBC (maybe in other CoinOR 
projects)? I searched the web and this ML but found nothing so far. 
Maybe I'm just using the wrong keywords.
Technically, this should not be that hard as the objects can just be 
wrappers for the matrix indices and the matrix can be rendered after all 
constraints have been added. So, before I reinvent the wheel I thought I 
better ask here ;) Thanks!

Cheers,
Felix

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