[FileFormats.MOF] support writing non-Float64 functions (#2247)

Author: odow

src/FileFormats/MOF/write.jl

@@ -141,7 +141,7 @@ end
 # ========== Typed scalar functions ==========
 
 function moi_to_object(
-    foo::MOI.ScalarAffineTerm{Float64},
+    foo::MOI.ScalarAffineTerm,
     name_map::Dict{MOI.VariableIndex,String},
 )
     return OrderedObject(
@@ -151,7 +151,7 @@ function moi_to_object(
 end
 
 function moi_to_object(
-    foo::MOI.ScalarAffineFunction{Float64},
+    foo::MOI.ScalarAffineFunction,
     name_map::Dict{MOI.VariableIndex,String},
 )
     return OrderedObject(
@@ -162,7 +162,7 @@ function moi_to_object(
 end
 
 function moi_to_object(
-    foo::MOI.ScalarQuadraticTerm{Float64},
+    foo::MOI.ScalarQuadraticTerm,
     name_map::Dict{MOI.VariableIndex,String},
 )
     return OrderedObject(
@@ -173,7 +173,7 @@ function moi_to_object(
 end
 
 function moi_to_object(
-    foo::MOI.ScalarQuadraticFunction{Float64},
+    foo::MOI.ScalarQuadraticFunction,
     name_map::Dict{MOI.VariableIndex,String},
 )
     return OrderedObject(

test/FileFormats/MOF/MOF.jl

@@ -1344,6 +1344,26 @@ function test_parse_nonlinear_objective_only()
     return
 end
 
+function test_integer_coefficients()
+    x = MOI.VariableIndex(1)
+    names = Dict(x => "x")
+    f = 2 * x * x + 3 * x + 4
+    @test MOF.moi_to_object(f, names) == MOF.OrderedObject(
+        "type" => "ScalarQuadraticFunction",
+        "affine_terms" =>
+            [MOF.OrderedObject("coefficient" => 3, "variable" => "x")],
+        "quadratic_terms" => [
+            MOF.OrderedObject(
+                "coefficient" => 4,
+                "variable_1" => "x",
+                "variable_2" => "x",
+            ),
+        ],
+        "constant" => 4,
+    )
+    return
+end
+
 end
 
 TestMOF.runtests()