Fixed the generated code when a default argument uses a constant.

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

src/Generator/Generators/CSharp/CSharpExpressionPrinter.cs

@@ -60,6 +60,10 @@ namespace CppSharp.Generators.CSharp
                         default:
                             return new CSharpExpressionPrinterResult { Value = expr.String };
                     }
+                case StatementClass.DeclarationReference:
+                    if (expr.Declaration is Variable)
+                        return new CSharpExpressionPrinterResult { Value = expr.Declaration.Name };
+                    goto default;
                 default:
                     return new CSharpExpressionPrinterResult { Value = expr.String };
             }

tests/CSharp/CSharp.Tests.cs

@@ -6,7 +6,7 @@ using CppSharp.Utils;
 using CSharp;
 using NUnit.Framework;
 
-public class CSharpTests : GeneratorTestFixture
+public unsafe class CSharpTests : GeneratorTestFixture
 {
     public class ExtendsWrapper : TestOverrideFromSecondaryBase
     {
@@ -210,6 +210,7 @@ public class CSharpTests : GeneratorTestFixture
             methodsWithDefaultValues.DefaultWithFunctionCall();
             methodsWithDefaultValues.DefaultWithPropertyCall();
             methodsWithDefaultValues.DefaultWithGetPropertyCall();
+            methodsWithDefaultValues.DefaultWithStringConstant();
         }
     }
 

tests/CSharp/CSharp.cpp

@@ -1,6 +1,6 @@
 #include "CSharp.h"
 
-Foo::Foo()
+Foo::Foo(char* name)
 {
     A = 10;
     P = 50;
@@ -381,6 +381,8 @@ MethodsWithDefaultValues::QMargins::QMargins(int left, int top, int right, int b
 {
 }
 
+char* MethodsWithDefaultValues::stringConstant = "test";
+
 MethodsWithDefaultValues::MethodsWithDefaultValues(Foo foo)
 {
     m_foo = foo;
@@ -535,6 +537,10 @@ void MethodsWithDefaultValues::defaultWithGetPropertyCall(int f)
 {
 }
 
+void MethodsWithDefaultValues::defaultWithStringConstant(const Foo& arg)
+{
+}
+
 int MethodsWithDefaultValues::getA()
 {
     return m_foo.A;

tests/CSharp/CSharp.h

@@ -5,7 +5,7 @@
 class DLL_API Foo
 {
 public:
-    Foo();
+    Foo(char* name = 0);
     Foo(int a, int p = 0);
     int method();
     int operator[](int i) const;
@@ -340,6 +340,8 @@ public:
         QMargins(int left, int top, int right, int bottom);
     };
 
+    static char* stringConstant;
+
     MethodsWithDefaultValues(Foo foo = Foo());
     MethodsWithDefaultValues(int a);
     MethodsWithDefaultValues(double d, QList<QColor> list = QList<QColor>());
@@ -382,6 +384,7 @@ public:
     void defaultWithFunctionCall(int f = Foo::makeFunctionCall());
     void defaultWithPropertyCall(int f = Foo::propertyCall());
     void defaultWithGetPropertyCall(int f = Foo::getGetPropertyCall());
+    void defaultWithStringConstant(const Foo& arg = Foo(stringConstant));
     int getA();
 private:
     Foo m_foo;