Adds field indicating integrality of the opt vars

[ValentinKaisermayer]

closes #270

[codecov]

Codecov Report

Merging #271 (a408227) into master (1b15460) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #271   +/-   ##
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  Coverage   54.84%   54.84%           
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  Files          41       41           
  Lines        2961     2961           
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  Hits         1624     1624           
  Misses       1337     1337           

Impacted Files	Coverage Δ
src/problems/basic_problems.jl	87.87% <ø> (ø)

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[Vaibhavdixit02]

Looks good, but I am curious about how you plan to use it. Do you have an example you tested this out on that you can show?

[ValentinKaisermayer]

Looks good, but I am curious about how you plan to use it. Do you have an example you tested this out on that you can show?

I'm working on it, see SciML/ModelingToolkit.jl#1786

[ValentinKaisermayer]

For instance, now it is trivial to add support for it with NOMAD.jl, in:
https://github.com/SciML/Optimization.jl/blob/b67636eeb5ee854fa53569e67bff3a21c5ed7a97/lib/OptimizationNOMAD/src/OptimizationNOMAD.jl#L80

Depending on the variable bounds lb and ub and the integrality indicator int the variable types can be inferred and are either "R", "B" or "I".

MTK got support for binary and integer variable metadata in SciML/ModelingToolkit.jl#1798.
And I'm planning to add support for other MOI solvers like CBC, or Gurobi, that support such variable types in SciML/Optimization.jl#381.

It should be just a matter of connecting all of it now. 😃

[Vaibhavdixit02]

I see, cool!