Added better wrapping for static classes.

src/AST/Class.cs

@@ -114,6 +114,9 @@ namespace CppSharp.AST
         // True if the class has a non trivial destructor.
         public bool HasNonTrivialDestructor;
 
+        // True if the class represents a static class.
+        public bool IsStatic;
+
         public Class()
         {
             Bases = new List<BaseClassSpecifier>();

src/Generator/Driver.cs

@@ -256,6 +256,7 @@ namespace CppSharp
             library.SetupPasses(this);
 
             TranslationUnitPasses.AddPass(new FindSymbolsPass());
+            TranslationUnitPasses.AddPass(new CheckStaticClass());
             TranslationUnitPasses.AddPass(new MoveOperatorToClassPass());
             TranslationUnitPasses.AddPass(new MoveFunctionToClassPass());
             TranslationUnitPasses.AddPass(new CheckAmbiguousFunctions());

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -360,6 +360,9 @@ namespace CppSharp.Generators.CLI
 
         public void GenerateClassConstructors(Class @class, string nativeType)
         {
+            if (@class.IsStatic)
+                return;
+
             PushIndent();
 
             // Output a default constructor that takes the native pointer.
@@ -566,10 +569,13 @@ namespace CppSharp.Generators.CLI
                 return true;
             }
 
-            if (CSharpTextTemplate.HasRefBase(@class))
-                Write(" : {0}", QualifiedIdentifier(@class.Bases[0].Class));
-            else if (@class.IsRefType)
-                Write(" : ICppInstance");
+            if (!@class.IsStatic)
+            {
+                if (CSharpTextTemplate.HasRefBase(@class))
+                    Write(" : {0}", QualifiedIdentifier(@class.Bases[0].Class));
+                else if (@class.IsRefType)
+                    Write(" : ICppInstance");
+            }
 
             NewLine();
             WriteLine("{");

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -135,15 +135,7 @@ namespace CppSharp.Generators.CLI
 
             GenerateDeclContext(@class);
 
-            // Output a default constructor that takes the native pointer.
-            GenerateClassConstructor(@class, isIntPtr: false);
-            GenerateClassConstructor(@class, isIntPtr: true);
-
-            if (@class.IsRefType)
-            {
-                GenerateClassDestructor(@class);
-                GenerateClassFinalizer(@class);
-            }
+            GenerateClassConstructors(@class);
 
             foreach (var method in @class.Methods)
             {
@@ -199,6 +191,22 @@ namespace CppSharp.Generators.CLI
             PopBlock();
         }
 
+        private void GenerateClassConstructors(Class @class)
+        {
+            if (@class.IsStatic)
+                return;
+
+            // Output a default constructor that takes the native pointer.
+            GenerateClassConstructor(@class, isIntPtr: false);
+            GenerateClassConstructor(@class, isIntPtr: true);
+
+            if (@class.IsRefType)
+            {
+                GenerateClassDestructor(@class);
+                GenerateClassFinalizer(@class);
+            }
+        }
+
         private void GenerateClassProperties(Class @class, Class realOwner)
         {
             if (@class.IsValueType)

src/Generator/Passes/CheckStaticClass.cs

@@ -0,0 +1,65 @@
+using System.Linq;
+using CppSharp.AST;
+
+namespace CppSharp.Passes
+{
+    /// <summary>
+    /// Checks for classes that should be bound as static classes.
+    /// </summary>
+    public class CheckStaticClass : TranslationUnitPass
+    {
+        static bool ReturnsClassInstance(Function function)
+        {
+            var returnType = function.ReturnType.Type.Desugar();
+
+            TagType tag;
+            if (!returnType.IsPointerTo(out tag))
+                return false;
+
+            var @class = (Class) function.Namespace;
+            var decl = tag.Declaration;
+
+            if (decl is Class)
+                return false;
+
+            return @class.QualifiedOriginalName == decl.QualifiedOriginalName;
+        }
+
+        public override bool VisitClassDecl(Class @class)
+        {
+            if (!VisitDeclaration(@class))
+                return false;
+
+            // If the class has any non-private constructors then it cannot
+            // be bound as a static class and we bail out early.
+            if (@class.Constructors.Any(m =>
+                !(m.IsCopyConstructor || m.IsMoveConstructor)
+                && m.Access != AccessSpecifier.Private))
+                return false;
+
+            // Check for any non-static fields or methods, in which case we
+            // assume the class is not meant to be static.
+            // Note: Static fields are represented as variables in the AST.
+            if (@class.Fields.Any() ||
+                @class.Methods.Any(m => m.Kind == CXXMethodKind.Normal
+                && !m.IsStatic))
+                return false;
+
+            // Check for any static function that return a pointer to the class.
+            // If one exists, we assume it's a factory function and the class is
+            // not meant to be static. It's a simple heuristic but it should be
+            // good enough for the time being.
+            if (@class.Functions.Any(ReturnsClassInstance))
+                return false;
+
+            // TODO: We should take C++ friends into account here, they might allow
+            // a class to be instantiated even it if's not possible to instantiate
+            // it using just its regular members.
+
+            // If all the above constraints hold, then we assume the class can be
+            // static.
+            @class.IsStatic = true;
+            return true;
+        }
+    }
+}

tests/Basic/Basic.Tests.cs

@@ -181,5 +181,11 @@ public class BasicTests : GeneratorTestFixture
         bar2.pointerToStruct.A = 15;
         Assert.That(bar2.pointerToStruct.A, Is.EqualTo(15));
     }
+
+    [Test]
+    public void TestStaticClasses()
+    {
+        Assert.That(TestStaticClass.Add(1, 2), Is.EqualTo(3));
+    }
 }
  

tests/Basic/Basic.h

@@ -253,3 +253,11 @@ struct DLL_API TestFinalizers
 {
 };
 
+// Tests static classes
+struct DLL_API TestStaticClass
+{
+    static int Add(int a, int b) { return a + b; }
+
+private:
+    TestStaticClass();
+};