Added conversion operators for ctors with default params.

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

src/Generator/Passes/ConstructorToConversionOperatorPass.cs

@@ -1,4 +1,5 @@
-using CppSharp.AST;
+using System.Linq;
+using CppSharp.AST;
 using CppSharp.AST.Extensions;
 
 namespace CppSharp.Passes
@@ -12,9 +13,25 @@ namespace CppSharp.Passes
         public override bool VisitMethodDecl(Method method)
         {
             if (AlreadyVisited(method) || !method.IsGenerated || !method.IsConstructor ||
-                method.IsCopyConstructor || method.Parameters.Count != 1)
+                method.IsCopyConstructor)
                 return false;
 
+            var @params = method.Parameters.Where(p => p.Kind == ParameterKind.Regular).ToList();
+            if (@params.Count == 0)
+                return false;
+
+            if (Driver.Options.GenerateDefaultValuesForArguments)
+            {
+                var nonDefaultParams = @params.Count(p => p.DefaultArgument == null);
+                if (nonDefaultParams > 1)
+                    return false;   
+            }
+            else
+            {
+                if (@params.Count != 1)
+                    return false;
+            }
+
             var parameter = method.Parameters[0];
             // TODO: disable implicit operators for C++/CLI because they seem not to be support parameters
             if (!Driver.Options.IsCSharpGenerator)

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -433,4 +433,13 @@ public class CSharpTempTests : GeneratorTestFixture
         ITestParamToInterfacePassBaseTwo interfaceTypePtr;
         obj.FuncTryInterfaceTypePtrOut(out interfaceTypePtr);
     }
+
+    [Test]
+    public void TestConversionForCtorWithDefaultParams()
+    {
+        using (Foo foo = 15)
+        {
+            Assert.That(foo.A, Is.EqualTo(15));
+        }
+    }
 }

tests/CSharpTemp/CSharpTemp.cpp

@@ -6,6 +6,12 @@ Foo::Foo()
     P = 50;
 }
 
+Foo::Foo(int a, int p)
+{
+    A = a;
+    P = p;
+}
+
 int Foo::method()
 {
     return 1;

tests/CSharpTemp/CSharpTemp.h

@@ -5,6 +5,7 @@ class DLL_API Foo
 {
 public:
     Foo();
+    Foo(int a, int p = 0);
     int method();
     int operator[](int i) const;
     int operator[](unsigned int i);