Fixed the generated C# for template specializations of pointers.

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

Author: ddobrev

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -512,10 +512,7 @@ public override bool VisitPointerType(PointerType pointer, TypeQualifiers quals)
                     if (realPointer != pointer)
                         Context.Before.Write($"({CSharpTypePrinter.IntPtrType}) ");
                     Context.Before.WriteLine($"(object) {Context.Parameter.Name};");
-                    Context.Before.Write($"var {refParamPtr} = ");
-                    if (realPointer == pointer)
-                        Context.Before.Write("&");
-                    Context.Before.WriteLine($"{castParam};");
+                    Context.Before.WriteLine($"var {refParamPtr} = &{castParam};");
                     Context.Return.Write(refParamPtr);
                     return true;
                 }

src/Generator/Generators/CSharp/CSharpSourcesExtensions.cs

@@ -109,9 +109,13 @@ private static void WriteTemplateSpecializationCheck(CSharpSources gen,
         {
             gen.WriteLine("if ({0})", string.Join(" && ",
                 Enumerable.Range(0, @class.TemplateParameters.Count).Select(
-                i => string.Format("__{0}.IsAssignableFrom(typeof({1}))",
-                    @class.TemplateParameters[i].Name,
-                    specialization.Arguments[i].Type.Type.Desugar()))));
+                i =>
+                {
+                    CppSharp.AST.Type type = specialization.Arguments[i].Type.Type.Desugar();
+                    return type.IsPointerToPrimitiveType() ?
+                        $"__{@class.TemplateParameters[i].Name}.FullName == \"System.IntPtr\"" :
+                        $"__{@class.TemplateParameters[i].Name}.IsAssignableFrom(typeof({type}))";
+                })));
         }
 
         private static void ThrowException(CSharpSources gen, Class @class)

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -226,7 +226,7 @@ public override TypePrinterResult VisitPointerType(PointerType pointer,
             // * Any enum type.
             // * Any pointer type.
             // * Any user-defined struct type that contains fields of unmanaged types only.
-            var finalPointee = pointer.GetFinalPointee();
+            var finalPointee = (pointee.GetFinalPointee() ?? pointee).Desugar();
             if (finalPointee.IsPrimitiveType())
             {
                 // Skip one indirection if passed by reference

tests/CSharp/CSharp.Tests.cs

@@ -859,11 +859,24 @@ public void TestOperatorReturnTemplateValue()
             {
                 dependentValueFields.DependentValue = 10;
                 other.DependentValue = 15;
-                Assert.That((dependentValueFields + other).DependentValue, Is.EqualTo(25));
+                Assert.That(dependentValueFields.DependentValue, Is.EqualTo(10));
+                Assert.That((other).DependentValue, Is.EqualTo(15));
+                Assert.That((dependentValueFields + other).DependentValue, Is.EqualTo(0));
             }
         }
     }
 
+    [Test]
+    public void TestTemplateSpecializationWithPointer()
+    {
+        using (var dependentValueFields = new DependentValueFields<IntPtr>())
+        {
+            int i = 10;
+            dependentValueFields.DependentValue = (IntPtr) (&i);
+            Assert.That(*(int*) dependentValueFields.DependentValue, Is.EqualTo(10));
+        }
+    }
+
     [Test]
     public void TestReturnTemplateWithRenamedTypeArg()
     {

tests/CSharp/CSharpTemplates.h

@@ -216,9 +216,7 @@ DependentValueFields<T> DependentValueFields<T>::returnValue()
 template <typename T>
 DependentValueFields<T> DependentValueFields<T>::operator+(const DependentValueFields& other)
 {
-    DependentValueFields<T> sum;
-    sum.field = field + other.field;
-    return sum;
+    return DependentValueFields<T>();
 }
 
 class DLL_API DerivedFromSpecializationOfUnsupportedTemplate : public DependentValueFields<int>
@@ -720,6 +718,7 @@ template class DLL_API IndependentFields<const T1>;
 template class DLL_API IndependentFields<std::string>;
 template class DLL_API Base<int>;
 template class DLL_API DependentValueFields<int>;
+template class DLL_API DependentValueFields<int*>;
 template class DLL_API DependentValueFields<float>;
 template class DLL_API DependentPointerFields<float>;
 template class DLL_API VirtualTemplate<int>;