Make indexers use non-trivial copy ctors if any

Fixes #1229.

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

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -1045,18 +1045,26 @@ namespace CppSharp.Generators.CSharp
             var internalFunction = GetFunctionNativeIdentifier(function);
             var paramMarshal = GenerateFunctionParamMarshal(
                 function.Parameters[0], 0, function);
+            string call = $@"{@internal}.{internalFunction}({
+                GetInstanceParam(function)}, {paramMarshal.Context.ArgumentPrefix}{paramMarshal.Name})";
             if (type.IsPrimitiveType())
             {
-                WriteLine($@"*{@internal}.{internalFunction}({
-                    GetInstanceParam(function)}, {paramMarshal.Context.ArgumentPrefix}{
-                    paramMarshal.Name}) = {marshal.Context.Return};");
+                WriteLine($"*{call} = {marshal.Context.Return};");
             }
             else
             {
-                var typeInternal = TypePrinter.PrintNative(type);
-                WriteLine($@"*({typeInternal}*) {@internal}.{internalFunction}({
-                    GetInstanceParam(function)}, {paramMarshal.Context.ArgumentPrefix}{
-                    paramMarshal.Name}) = {marshal.Context.Return};");
+                Class @class;
+                if (type.TryGetClass(out @class) && @class.HasNonTrivialCopyConstructor)
+                {
+                    Method cctor = @class.Methods.First(c => c.IsCopyConstructor);
+                    WriteLine($@"{@class.Visit(TypePrinter)}.{Helpers.InternalStruct}.{
+                        GetFunctionNativeIdentifier(cctor)}({call}, {
+                        ctx.Parameter.Name}.{Helpers.InstanceIdentifier});");
+                }
+                else
+                {
+                    WriteLine($"*({TypePrinter.PrintNative(type)}*) {call} = {marshal.Context.Return};");
+                }
             }
         }
 

tests/CSharp/CSharp.Tests.cs

@@ -1279,10 +1279,10 @@ public unsafe class CSharpTests : GeneratorTestFixture
     [Test]
     public void TestImplicitConversionToString()
     {
-        using (Foo foo = new Foo())
+        using (Foo foo = new Foo("name"))
         {
             string name = foo;
-            Assert.That(name, Is.EqualTo("test"));
+            Assert.That(name, Is.EqualTo("name"));
         }
     }
 

tests/CSharp/CSharp.cpp

@@ -10,6 +10,10 @@ Foo::Foo(const char* name) : publicFieldMappedToEnum(TestFlag::Flag2)
 {
     A = 10;
     P = 50;
+    if (name)
+    {
+        _name = name;
+    }
 }
 
 Foo::Foo(int a, int p) : publicFieldMappedToEnum(TestFlag::Flag2)
@@ -26,6 +30,15 @@ Foo::Foo(wchar_t ch)
 {
 }
 
+Foo::Foo(const Foo& other) : A(other.A), P(other.P),
+    templateInAnotherUnit(other.templateInAnotherUnit), _name(other._name)
+{
+}
+
+Foo::~Foo()
+{
+}
+
 int Foo::method()
 {
     return 1;
@@ -106,7 +119,7 @@ int Foo::operator --()
 
 Foo::operator const char*() const
 {
-    return "test";
+    return _name.data();
 }
 
 const Foo& Bar::operator[](int i) const
@@ -220,6 +233,10 @@ Bar::Bar(Items item)
 {
 }
 
+Bar::~Bar()
+{
+}
+
 int Bar::method()
 {
     return 2;
@@ -268,10 +285,18 @@ ForceCreationOfInterface::ForceCreationOfInterface()
 {
 }
 
+ForceCreationOfInterface::~ForceCreationOfInterface()
+{
+}
+
 Baz::Baz(Bar::Items item)
 {
 }
 
+Baz::~Baz()
+{
+}
+
 int Baz::takesQux(const Qux& qux)
 {
     return qux.farAwayFunc();
@@ -909,6 +934,10 @@ TestOverrideFromSecondaryBase::TestOverrideFromSecondaryBase()
 {
 }
 
+TestOverrideFromSecondaryBase::~TestOverrideFromSecondaryBase()
+{
+}
+
 void TestOverrideFromSecondaryBase::VirtualMember()
 {
 }
@@ -975,10 +1004,18 @@ InheritanceBuffer::InheritanceBuffer()
 {
 }
 
+InheritanceBuffer::~InheritanceBuffer()
+{
+}
+
 InheritsProtectedVirtualFromSecondaryBase::InheritsProtectedVirtualFromSecondaryBase()
 {
 }
 
+InheritsProtectedVirtualFromSecondaryBase::~InheritsProtectedVirtualFromSecondaryBase()
+{
+}
+
 void InheritsProtectedVirtualFromSecondaryBase::protectedVirtual()
 {
 }

tests/CSharp/CSharp.h

@@ -16,6 +16,8 @@ public:
     Foo(int a, int p = 0);
     Foo(char16_t ch);
     Foo(wchar_t ch);
+    Foo(const Foo& other);
+    ~Foo();
     int method();
     int operator[](int i) const;
     int operator[](unsigned int i);
@@ -46,6 +48,7 @@ public:
 protected:
     int P;
     TemplateInAnotherUnit<int> templateInAnotherUnit;
+    std::string _name;
 };
 
 class DLL_API Quux
@@ -94,6 +97,7 @@ public:
     Bar();
     Bar(Qux qux);
     Bar(Items item);
+    ~Bar();
     int method();
     const Foo& operator[](int i) const;
     Foo& operator[](int i);
@@ -122,6 +126,7 @@ class DLL_API ForceCreationOfInterface : public Foo, public Bar
 {
 public:
     ForceCreationOfInterface();
+    ~ForceCreationOfInterface();
 };
 
 class DLL_API Baz : public Foo, public Bar
@@ -137,6 +142,7 @@ public:
 
     Baz();
     Baz(Bar::Items item);
+    ~Baz();
 
     int P;
 
@@ -689,6 +695,7 @@ class DLL_API TestOverrideFromSecondaryBase : public Foo, public SecondaryBase
 {
 public:
     TestOverrideFromSecondaryBase();
+    ~TestOverrideFromSecondaryBase();
     void VirtualMember();
     void setProperty(int value);
 };
@@ -729,12 +736,14 @@ class DLL_API InheritanceBuffer : public Foo, public HasProtectedVirtual
 {
 public:
     InheritanceBuffer();
+    ~InheritanceBuffer();
 };
 
 class DLL_API InheritsProtectedVirtualFromSecondaryBase : public InheritanceBuffer
 {
 public:
     InheritsProtectedVirtualFromSecondaryBase();
+    ~InheritsProtectedVirtualFromSecondaryBase();
 protected:
     void protectedVirtual();
 };

tests/Common/Common.cpp

@@ -527,6 +527,15 @@ TestProperties::TestProperties() : Field(0), _refToPrimitiveInSetter(0),
 {
 }
 
+TestProperties::TestProperties(const TestProperties& other) : Field(other.Field),
+    FieldValue(other.FieldValue),
+    _refToPrimitiveInSetter(other._refToPrimitiveInSetter),
+    _getterAndSetterWithTheSameName(other._getterAndSetterWithTheSameName),
+    _setterReturnsBoolean(other._setterReturnsBoolean),
+    _virtualSetterReturnsBoolean(other._virtualSetterReturnsBoolean)
+{
+}
+
 int TestProperties::getFieldValue()
 {
     return Field;

tests/Common/Common.h

@@ -585,6 +585,7 @@ public:
     };
 
     TestProperties();
+    TestProperties(const TestProperties& other);
     int Field;
 
     int getFieldValue();