Add support for un-instantiated inner optimizers

Author: odow

README.md

@@ -35,7 +35,7 @@ Use ParametricOptInterface with JuMP by following this brief example:
 ```julia
 using JuMP, HiGHS
 import ParametricOptInterface as POI
-model = direct_model(POI.Optimizer(HiGHS.Optimizer()))
+model = direct_model(POI.Optimizer(HiGHS.Optimizer))
 @variable(model, x)
 @variable(model, p in Parameter(1.0))
 @constraint(model, cons, x + p >= 3)

benchmark/MOI_benchmarks.jl

@@ -165,11 +165,7 @@ function solve_moi(
 end
 
 function POI_OPTIMIZER()
-    return POI.Optimizer(SOLVER.Optimizer())
-end
-
-function MOI_OPTIMIZER()
-    return SOLVER.Optimizer()
+    return POI.Optimizer(SOLVER.Optimizer)
 end
 
 function solve_moi_loop(
@@ -194,7 +190,7 @@ function solve_moi_loop(
         for _ in 1:loops
             solve_moi(
                 data,
-                MOI_OPTIMIZER;
+                SOLVER.Optimizer();
                 vector_version = vector_version,
                 params = params,
             )

docs/Project.toml

@@ -5,10 +5,12 @@ Ipopt = "b6b21f68-93f8-5de0-b562-5493be1d77c9"
 JuMP = "4076af6c-e467-56ae-b986-b466b2749572"
 MathOptInterface = "b8f27783-ece8-5eb3-8dc8-9495eed66fee"
 ParametricOptInterface = "0ce4ce61-57bf-432b-a095-efac525d185e"
+SCS = "c946c3f1-0d1f-5ce8-9dea-7daa1f7e2d13"
 
 [compat]
 Documenter = "1"
 HiGHS = "1"
 Ipopt = "1"
 JuMP = "1"
 MathOptInterface = "1.13.2"
+SCS = "2"