Fix templated indexers returning objects

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

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -278,7 +278,9 @@ namespace CppSharp.Generators.CSharp
             if (finalType.TryGetClass(out returnedClass) && returnedClass.IsDependent)
                 Context.Return.Write($"({returnType.Visit(typePrinter)}) (object) ");
 
-            if (returnType.IsAddress())
+            // these two aren't the same for members of templates
+            if (Context.Function?.OriginalReturnType.Type.Desugar().IsAddress() == true ||
+                returnType.IsAddress())
                 Context.Return.Write(HandleReturnedPointer(@class, qualifiedClass));
             else
             {

tests/CSharp/CSharp.Tests.cs

@@ -1176,17 +1176,20 @@ public unsafe class CSharpTests
             templateWithIndexer["test"] = 15;
             Assert.That(templateWithIndexer["test"], Is.EqualTo(15));
         }
-        using (var templateWithIndexer = new TemplateWithIndexer<T1>())
+        using (var templateWithIndexer = new TemplateWithIndexer<T2>())
         {
-            using (var t1 = new T1(10))
+            using (var t2 = new T2())
             {
-                templateWithIndexer[0] = t1;
-                Assert.That(templateWithIndexer[0].Field, Is.EqualTo(t1.Field));
+                templateWithIndexer[0] = t2;
+                var item = templateWithIndexer[0];
+                Assert.That(item.Field, Is.EqualTo(t2.Field));
+                item.Field = 5;
+                Assert.That(templateWithIndexer[0].Field, Is.EqualTo(5));
             }
-            using (var t1 = new T1(15))
+            using (var t2 = new T2(15))
             {
-                templateWithIndexer["test"] = t1;
-                Assert.That(templateWithIndexer["test"].Field, Is.EqualTo(t1.Field));
+                templateWithIndexer["test"] = t2;
+                Assert.That(templateWithIndexer["test"].Field, Is.EqualTo(t2.Field));
             }
         }
     }

tests/CSharp/CSharpTemplates.cpp

@@ -1,29 +1,26 @@
 #include "CSharpTemplates.h"
 
-T1::T1()
+T2::T2() : field(0)
 {
 }
 
-T1::T1(const T1& other) : field(other.field)
-{
-}
-
-T1::T1(int f)
+T2::T2(int f)
 {
     field = f;
 }
 
-T1::~T1()
+T2::~T2()
 {
 }
 
-int T1::getField() const
+int T2::getField() const
 {
     return field;
 }
 
-T2::T2()
+void T2::setField(int value)
 {
+    field = value;
 }
 
 DerivedFromSpecializationOfUnsupportedTemplate::DerivedFromSpecializationOfUnsupportedTemplate()

tests/CSharp/CSharpTemplates.h

@@ -12,20 +12,18 @@ class DLL_API QString
 
 class DLL_API T1
 {
-public:
-    T1();
-    T1(const T1& other);
-    T1(int f);
-    ~T1();
-    int getField() const;
-private:
-    int field;
 };
 
 class DLL_API T2
 {
 public:
     T2();
+    T2(int f);
+    virtual ~T2();
+    int getField() const;
+    void setField(int value);
+private:
+    int field;
 };
 
 class DLL_API Ignored
@@ -92,7 +90,7 @@ IndependentFields<T>::IndependentFields(float f)
 }
 
 template <typename T>
-IndependentFields<T>::IndependentFields(const std::map<T, T> &v)
+IndependentFields<T>::IndependentFields(const std::map<T, T> &v) : independent(1)
 {
 }