Added support for writing using indexers.

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

build/Tests.lua

@@ -90,6 +90,7 @@ function SetupTestProjectsCSharp(name, file, lib)
     kind "SharedLib"
     language "C#"
     location "."
+    flags { "Unsafe" }
 
     files { name .. ".Tests.cs" }
     links { name .. ".CSharp" }

src/AST/Type.cs

@@ -47,6 +47,11 @@ namespace CppSharp.AST
             return tag.Declaration is Enumeration;
         }
 
+        public bool IsAddress()
+        {
+            return IsPointer() || IsReference();
+        }
+
         public bool IsPointer()
         {
             var functionPointer = this as MemberPointerType;

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -239,6 +239,7 @@ namespace CppSharp.Generators.CSharp
             }
 
             if (@class.IsRefType &&
+                (Context.ReturnType.Qualifiers.IsConst || !Context.ReturnType.Type.IsAddress()) &&
                 (!Context.Driver.Options.GenerateAbstractImpls || !@class.IsAbstract))
             {
                 var instanceName = Generator.GeneratedIdentifier("instance");
@@ -533,7 +534,7 @@ namespace CppSharp.Generators.CSharp
                 return;
             }
 
-            if (Context.Parameter.Type.IsPointer() || Context.Parameter.Type.IsReference())
+            if (Context.Parameter.Type.IsAddress())
             {
                 Context.Return.Write("{0}.{1}", Helpers.SafeIdentifier(Context.Parameter.Name),
                     Helpers.InstanceIdentifier);

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -725,7 +725,7 @@ namespace CppSharp.Generators.CSharp
             return Tuple.Create(library, decl.Mangled);
         }
 
-        private void GeneratePropertySetter<T>(T decl, Class @class)
+        private void GeneratePropertySetter<T>(QualifiedType returnType, T decl, Class @class)
             where T : Declaration, ITypedDecl
         {
             PushBlock(CSharpBlockKind.Method);
@@ -753,8 +753,16 @@ namespace CppSharp.Generators.CSharp
 
                 param.QualifiedType = function.Parameters[0].QualifiedType;
 
-                var parameters = new List<Parameter> { param };
-                GenerateInternalFunctionCall(function, parameters);
+                var method = function as Method;
+                if (method != null && method.IsSynthetized)
+                {
+                    GenerateIndexerSetter(returnType, method);
+                }
+                else
+                {
+                    var parameters = new List<Parameter> { param };
+                    GenerateInternalFunctionCall(function, parameters);   
+                }
             }
             else if (decl is Field)
             {
@@ -779,6 +787,23 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
+        private void GenerateIndexerSetter(QualifiedType returnType, Function function)
+        {
+            Type type;
+            returnType.Type.IsPointerTo(out type);
+            PrimitiveType primitiveType;
+            if (type.IsPrimitiveType(out primitiveType))
+            {
+                WriteLine("*({0}*) this[{1}] = *({0}*) value;",
+                    type.ToString(), function.Parameters[0].Name);
+            }
+            else
+            {
+                WriteLine("*({0}.Internal*) this[{1}].{2} = *({0}.Internal*) value.{2};",
+                    type.ToString(), function.Parameters[0].Name, Helpers.InstanceIdentifier);
+            }
+        }
+
         private void GeneratePropertyGetter<T>(T decl, Class @class)
             where T : Declaration, ITypedDecl
         {
@@ -907,7 +932,7 @@ namespace CppSharp.Generators.CSharp
                         GeneratePropertyGetter(prop.Field, @class);
 
                     if (prop.HasSetter)
-                        GeneratePropertySetter(prop.Field, @class);
+                        GeneratePropertySetter(prop.Field.QualifiedType, prop.Field, @class);
                 }
                 else
                 {
@@ -915,7 +940,7 @@ namespace CppSharp.Generators.CSharp
                         GeneratePropertyGetter(prop.GetMethod, @class);
 
                     if (prop.HasSetter)
-                        GeneratePropertySetter(prop.SetMethod, @class);
+                        GeneratePropertySetter(prop.GetMethod.ReturnType, prop.SetMethod, @class);
                 }
 
                 WriteCloseBraceIndent();
@@ -938,7 +963,7 @@ namespace CppSharp.Generators.CSharp
             GeneratePropertyGetter(variable, @class);
 
             if (!variable.QualifiedType.Qualifiers.IsConst)
-                GeneratePropertySetter(variable, @class);
+                GeneratePropertySetter(variable.QualifiedType, variable, @class);
 
             WriteCloseBraceIndent();
             PopBlock(NewLineKind.BeforeNextBlock);

src/Generator/Passes/CheckOperatorsOverloads.cs

@@ -86,14 +86,23 @@ namespace CppSharp.Passes
         private static void CreateIndexer(Class @class, Method @operator)
         {
             Property property = new Property
-            {
-                Name = "Item",
-                QualifiedType = @operator.ReturnType,
-                Access = @operator.Access,
-                Namespace = @class,
-                GetMethod = @operator
-            };
+                {
+                    Name = "Item",
+                    QualifiedType = @operator.ReturnType,
+                    Access = @operator.Access,
+                    Namespace = @class,
+                    GetMethod = @operator
+                };
             property.Parameters.AddRange(@operator.Parameters);
+            if (!@operator.ReturnType.Qualifiers.IsConst && @operator.ReturnType.Type.IsAddress())
+            {
+                property.SetMethod = new Method(@operator)
+                                        {
+                                            ReturnType = new QualifiedType(
+                                                new BuiltinType(PrimitiveType.Void)),
+                                            IsSynthetized = true
+                                        };
+            }
             @class.Properties.Add(property);
             @operator.IsGenerated = false;
         }

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -1,4 +1,6 @@
-using System.Reflection;
+using System;
+using System.Reflection;
+using CSharpTemp;
 using NUnit.Framework;
 using Foo = CSharpTemp.Foo;
 
@@ -6,10 +8,24 @@ using Foo = CSharpTemp.Foo;
 public class CSharpTempTests
 {
     [Test]
-    public void TestIndexer()
+    public unsafe void TestIndexer()
     {
         var foo = new Foo();
-        Assert.That(foo[0], Is.EqualTo(5));
+
+        // TODO: Most of the ugliness below will disappear when pointers to simple types are represented by C#-pointers or ref modifiers instead of the nasty IntPtr
+        var value = *(int*) foo[0];
+        Assert.That(value, Is.EqualTo(50));
+        int x = 250;
+        foo[0] = new IntPtr(&x);
+        value = *(int*) foo[0];
+        Assert.That(value, Is.EqualTo(x));
+
+        Assert.That(foo[(uint) 0], Is.EqualTo(15));
+        
+        var bar = new Bar();
+        Assert.That(bar[0].A, Is.EqualTo(10));
+        bar[0] = new Foo { A = 25 };
+        Assert.That(bar[0].A, Is.EqualTo(25));
     }
 
     [Test]

tests/CSharpTemp/CSharpTemp.cpp

@@ -1,12 +1,32 @@
 #include "CSharpTemp.h"
 
-// TODO: move this, it has nothing to do with Unicode, it's here only not to break the CLI branch
+Foo::Foo()
+{
+    A = 10;
+    P = 50;
+}
+
 int Foo::operator[](int i) const
 {
     return 5;
 }
 
-int Foo::operator[](int i)
+int Foo::operator[](unsigned int i)
 {
-    return 5;
-}
+    return 15;
+}
+
+int& Foo::operator[](int i)
+{
+    return P;
+}
+
+const Foo& Bar::operator[](int i) const
+{
+    return m_foo;
+}
+
+Foo& Bar::operator[](int i)
+{
+    return m_foo;
+}

tests/CSharpTemp/CSharpTemp.h

@@ -7,9 +7,22 @@
 class DLL_API Foo
 {
 public:
+    Foo();
     int operator[](int i) const;
-    int operator[](int i);
+    int operator[](unsigned int i);
+    int& operator[](int i);
+    int A;
 
 protected:
     int P;
 };
+
+class DLL_API Bar
+{
+public:
+    const Foo& operator[](int i) const;
+    Foo& operator[](int i);
+
+private:
+    Foo m_foo;
+};