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Clarify Env module constants in README #521

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Oct 18, 2023
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Clarify Env module constants in README #521

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Clarify Env module constants in README
odow Oct 17, 2023
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Update README.md
odow Oct 18, 2023
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23 changes: 23 additions & 0 deletions README.md
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Expand Up @@ -150,6 +150,29 @@ model_2 = direct_model(Gurobi.Optimizer(GRB_ENV))
set_attribute(model_2, "OutputFlag", 0)
```

If you create a module with a `Gurobi.Env` as a module-level constant, use an
`__init__` function to ensure that a new environment is created each time the
module is loaded:

```julia
module MyModule

import Gurobi

const GRB_ENV_REF = Ref{Gurobi.Env}()

function __init__()
global GRB_ENV_REF
GRB_ENV_REF[] = Gurobi.Env()
return
end

# Note the need for GRB_ENV_REF[] not GRB_ENV_REF
create_optimizer() = Gurobi.Optimizer(GRB_ENV_REF[])

end
```

## Accessing Gurobi-specific attributes

Get and set Gurobi-specific variable, constraint, and model attributes as
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