Add MapNotInvertible

Author: blegat

src/Bridges/Constraint/set_map.jl

@@ -102,7 +102,15 @@ function MOI.get(
     bridge::MultiSetMapBridge{T,S1,G},
 ) where {T,S1,G}
     mapped_func = MOI.get(model, attr, bridge.constraint)
-    func = MOI.Bridges.inverse_map_function(bridge, mapped_func)
+    func = try
+        MOI.Bridges.inverse_map_function(bridge, mapped_func)
+    catch err
+        if err isa MOI.Bridges.MapNotInvertible
+            throw(MOI.GetAttributeNotAllowed(attr))
+        else
+            rethrow(err)
+        end
+    end
     return MOI.Utilities.convert_approx(G, func)
 end
 
@@ -146,7 +154,16 @@ function MOI.get(
     if value === nothing
         return nothing
     end
-    return MOI.Bridges.inverse_map_function(bridge, value)
+    return try
+        MOI.Bridges.inverse_map_function(bridge, value)
+    catch err
+        if err isa MOI.Bridges.MapNotInvertible
+            throw(MOI.GetAttributeNotAllowed(attr))
+        else
+            rethrow(err)
+        end
+    end
+
 end
 
 function MOI.set(

src/Bridges/set_map.jl

@@ -4,6 +4,8 @@
 # Use of this source code is governed by an MIT-style license that can be found
 # in the LICENSE.md file or at https://opensource.org/licenses/MIT.
 
+struct MapNotInvertible <: Exception end
+
 """
     map_set(::Type{BT}, set) where {BT}
 
@@ -44,6 +46,10 @@ the [`MOI.VariablePrimal`](@ref) and
 """
 function map_function end
 
+function map_function(bridge::AbstractBridge, func)
+    return map_function(typeof(bridge), func)
+end
+
 function map_function(::Type{BT}, func, i::IndexInVector) where {BT}
     return MOI.Utilities.eachscalar(map_function(BT, func))[i.value]
 end