Added better support for unary operators.

src/AST/Method.cs

@@ -10,6 +10,12 @@ namespace CppSharp.AST
         UsingDirective
     }
 
+    public enum CXXOperatorArity
+    {
+        Unary,
+        Binary
+    }
+
     public enum CXXOperatorKind
     {
         None,

src/Generator/AST/Utils.cs

@@ -54,6 +54,14 @@ namespace CppSharp.AST
 
     public static class Operators
     {
+        public static CXXOperatorArity ClassifyOperator(Function function)
+        {
+            if (function.Parameters.Count == 1)
+                return CXXOperatorArity.Unary;
+
+            return CXXOperatorArity.Binary;
+        }
+
         public static string GetOperatorOverloadPair(CXXOperatorKind kind)
         {
             switch (kind)

src/Generator/Generators/CLI/CLISourcesTemplate.cs

@@ -745,15 +745,18 @@ namespace CppSharp.Generators.CLI
 
             if (function.IsOperator)
             {
-                var kind = function.OperatorKind;
-
-                var isBinary = function.Parameters.Count > 0;
                 var opName = function.Name.Replace("operator", "").Trim();
 
-                // Binary operator
-                if (isBinary)
+                switch (Operators.ClassifyOperator(function))
+                {
+                case CXXOperatorArity.Unary:
+                    WriteLine("{0} {1};", opName, @params[0].Name);
+                    break;
+                case CXXOperatorArity.Binary:
                     WriteLine("{0} {1} {2};", @params[0].Name, opName,
                         @params[1].Name);
+                    break;
+                }
             }
             else
             {

tests/Basic/Basic.Tests.cs

@@ -44,7 +44,16 @@ public class BasicTests
     }
 
     [Test]
-    public void TestFunctionOperator()
+    public void TestUnaryOperator()
+    {
+        var bar = new Bar { A = 4, B = 7 };
+        var barMinus = -bar;
+        Assert.That(barMinus.A, Is.EqualTo(-bar.A));
+        Assert.That(barMinus.B, Is.EqualTo(-bar.B));
+    }
+
+    [Test]
+    public void TestBinaryOperator()
     {
         var bar = new Bar { A = 4, B = 7 };
         var bar1 = new Bar { A = 5, B = 10 };

tests/Basic/Basic.cpp

@@ -81,6 +81,14 @@ const wchar_t* wcharFunction(const wchar_t* constWideChar)
     return constWideChar;
 }
 
+Bar operator-(const Bar& b)
+{
+    Bar nb;
+    nb.A = -b.A;
+    nb.B = -b.B;
+    return nb;
+}
+
 Bar operator+(const Bar& b1, const Bar& b2)
 {
     Bar b;

tests/Basic/Basic.h

@@ -71,6 +71,7 @@ public:
     int RetEnum(Enum);
 };
 
+DLL_API Bar operator-(const Bar &);
 DLL_API Bar operator+(const Bar &, const Bar &);
 
 int DLL_API unsafeFunction(const Bar& ret, char* testForString, void (*foo)(int));