Fixed overloading of operators with parameters mapped to the same type.

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

Author: ddobrev

src/Generator/Passes/CheckAmbiguousFunctions.cs

@@ -1,8 +1,10 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using CppSharp.AST;
 using CppSharp.AST.Extensions;
 using CppSharp.Types;
+using CppSharp.Generators;
 
 namespace CppSharp.Passes
 {
@@ -68,13 +70,16 @@ public override bool VisitFunctionDecl(AST.Function function)
 
         private bool CheckDefaultParametersForAmbiguity(Function function, Function overload)
         {
-            var commonParameters = Math.Min(function.Parameters.Count, overload.Parameters.Count);
+            List<Parameter> functionParams = RemoveOperatorParams(function);
+            List<Parameter> overloadParams = RemoveOperatorParams(overload);
+
+            var commonParameters = Math.Min(functionParams.Count, overloadParams.Count);
 
             var i = 0;
             for (; i < commonParameters; ++i)
             {
-                AST.Type funcType = GetFinalType(function.Parameters[i]);
-                AST.Type overloadType = GetFinalType(overload.Parameters[i]);
+                AST.Type funcType = GetFinalType(functionParams[i]);
+                AST.Type overloadType = GetFinalType(overloadParams[i]);
 
                 AST.Type funcPointee = funcType.GetFinalPointee() ?? funcType;
                 AST.Type overloadPointee = overloadType.GetFinalPointee() ?? overloadType;
@@ -85,28 +90,53 @@ private bool CheckDefaultParametersForAmbiguity(Function function, Function over
                     return false;
             }
 
-            for (; i < function.Parameters.Count; ++i)
+            for (; i < functionParams.Count; ++i)
             {
-                var funcParam = function.Parameters[i];
+                var funcParam = functionParams[i];
                 if (!funcParam.HasDefaultValue)
                     return false;
             }
 
-            for (; i < overload.Parameters.Count; ++i)
+            for (; i < overloadParams.Count; ++i)
             {
-                var overloadParam = overload.Parameters[i];
+                var overloadParam = overloadParams[i];
                 if (!overloadParam.HasDefaultValue)
                     return false;
             }
 
-            if (function.Parameters.Count > overload.Parameters.Count)
+            if (functionParams.Count > overloadParams.Count)
                 overload.ExplicitlyIgnore();
             else
                 function.ExplicitlyIgnore();
 
             return true;
         }
 
+        private List<Parameter> RemoveOperatorParams(Function function)
+        {
+            var functionParams = new List<Parameter>(function.Parameters);
+
+            if (!function.IsOperator ||
+                (Context.Options.GeneratorKind != GeneratorKind.CLI &&
+                 Context.Options.GeneratorKind != GeneratorKind.CSharp))
+                return functionParams;
+
+            // C++ operators in a class have no class param unlike C#
+            // but we need to be able to compare them to free operators.
+            Parameter param = functionParams.Find(p => p.Kind == ParameterKind.Regular);
+            if (param != null)
+            {
+                AST.Type type = param.Type.Desugar();
+                type = (type.GetFinalPointee() ?? type).Desugar();
+                Class @class;
+                if (type.TryGetClass(out @class) &&
+                    function.Namespace == @class)
+                    functionParams.Remove(param);
+            }
+
+            return functionParams;
+        }
+
         private AST.Type GetFinalType(Parameter parameter)
         {
             TypeMap typeMap;

tests/Common/Common.Tests.cs

@@ -632,10 +632,13 @@ public void TestEqualityOperator()
         var bar = new Bar { A = 5, B = 5.5f };
         Assert.IsTrue(bar == bar);
         Assert.IsFalse(new Bar { A = 5, B = 5.6f } == bar);
+#if !__MonoCS__
         using (var differentConstOverloads = new DifferentConstOverloads())
         {
-            Assert.IsTrue(differentConstOverloads != null);
+            DifferentConstOverloads other = null;
+            Assert.IsTrue(differentConstOverloads != other);
         }
+#endif
 
 #pragma warning restore 1718
     }
@@ -654,7 +657,10 @@ public void TestOperatorOverloads()
     {
         var differentConstOverloads = new DifferentConstOverloads();
         Assert.IsTrue(differentConstOverloads == new DifferentConstOverloads());
-        Assert.IsFalse(differentConstOverloads == 5);
+        Assert.IsTrue(differentConstOverloads == 5);
+        Assert.IsFalse(differentConstOverloads == 4);
+        Assert.IsTrue(differentConstOverloads == "abcde");
+        Assert.IsFalse(differentConstOverloads == "abcd");
     }
 
     [Test]

tests/Common/Common.cpp

@@ -652,6 +652,11 @@ DifferentConstOverloads::DifferentConstOverloads() : i(5)
 {
 }
 
+int DifferentConstOverloads::getI() const
+{
+    return i;
+}
+
 bool DifferentConstOverloads::operator ==(const DifferentConstOverloads& other)
 {
     return i == other.i;
@@ -664,7 +669,17 @@ bool DifferentConstOverloads::operator !=(const DifferentConstOverloads& other)
 
 bool DifferentConstOverloads::operator ==(int number) const
 {
-    return false;
+    return i == number;
+}
+
+bool DifferentConstOverloads::operator ==(std::string s) const
+{
+    return i == s.length();
+}
+
+bool operator ==(const DifferentConstOverloads& d, const char* s)
+{
+    return d.getI() == strlen(s);
 }
 
 int HasVirtualProperty::getProperty()

tests/Common/Common.h

@@ -900,13 +900,17 @@ class DLL_API DifferentConstOverloads
 {
 public:
     DifferentConstOverloads();
+    int getI() const;
     bool operator ==(const DifferentConstOverloads& other);
     bool operator !=(const DifferentConstOverloads& other);
     bool operator ==(int number) const;
+    bool operator ==(std::string s) const;
 private:
     int i;
 };
 
+DLL_API bool operator ==(const DifferentConstOverloads& d, const char* s);
+
 class TestNamingAnonymousTypesInUnion
 {
 public: