Match names of parameters in templates to their specializations

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Driver.cs

@@ -216,6 +216,7 @@ namespace CppSharp
 
             TranslationUnitPasses.AddPass(new ResolveIncompleteDeclsPass());
             TranslationUnitPasses.AddPass(new IgnoreSystemDeclarationsPass());
+            TranslationUnitPasses.AddPass(new MatchParamNamesWithInstantiatedFromPass());
 
             if (Options.IsCSharpGenerator)
                 TranslationUnitPasses.AddPass(new EqualiseAccessOfOverrideAndBasePass());

src/Generator/Passes/MatchParamNamesWithInstantiatedFromPass.cs

@@ -0,0 +1,28 @@
+using CppSharp.AST;
+
+namespace CppSharp.Passes
+{
+    /// <summary>
+    /// Fixes a so far irreproducible bug where parameters in a template have names
+    /// different from the ones the respective parameters have in the specializations.
+    /// </summary>
+    public class MatchParamNamesWithInstantiatedFromPass : TranslationUnitPass
+    {
+        public MatchParamNamesWithInstantiatedFromPass() => VisitOptions.ResetFlags(
+            VisitFlags.ClassMethods | VisitFlags.NamespaceFunctions |
+            VisitFlags.ClassTemplateSpecializations);
+
+        public override bool VisitFunctionDecl(Function function)
+        {
+            if (!base.VisitFunctionDecl(function) || function.InstantiatedFrom == null ||
+                (function.Namespace is ClassTemplateSpecialization specialization &&
+                 specialization.SpecializationKind == TemplateSpecializationKind.ExplicitSpecialization))
+                return false;
+
+            for (int i = 0; i < function.Parameters.Count; i++)
+                function.InstantiatedFrom.Parameters[i].Name = function.Parameters[i].Name;
+
+            return true;
+        }
+    }
+}