[generator] Improved processing for C++ inline namespaces.

src/AST/Declaration.cs

@@ -144,6 +144,8 @@ namespace CppSharp.AST
             var currentNamespace = @namespace;
             while (currentNamespace != null)
             {
+                var isInlineNamespace = currentNamespace is Namespace && ((Namespace)currentNamespace).IsInline;
+                if (!isInlineNamespace)
                     namespaces.Push(currentNamespace);
                 currentNamespace = currentNamespace.Namespace;
             }

src/Generator/Generators/CLI/CLIHeaders.cs

@@ -185,7 +185,7 @@ namespace CppSharp.Generators.CLI
         public void GenerateNamespace(Namespace @namespace)
         {
             var isTopLevel = @namespace is TranslationUnit;
-            var generateNamespace = !isTopLevel ||
+            var generateNamespace = !isTopLevel || !@namespace.IsInline &&
                 !string.IsNullOrEmpty(@namespace.TranslationUnit.Module.OutputNamespace);
 
             if (generateNamespace)

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -158,11 +158,9 @@ namespace CppSharp.Generators.CSharp
         public override bool VisitNamespace(Namespace @namespace)
         {
             var context = @namespace;
-
-            var isNamespace = context is Namespace;
             var isTranslationUnit = context is TranslationUnit;
 
-            var shouldGenerateNamespace = isNamespace && !isTranslationUnit &&
+            var shouldGenerateNamespace = !@namespace.IsInline && !isTranslationUnit &&
                 context.Declarations.Any(d => d.IsGenerated || (d is Class && !d.IsIncomplete));
 
             if (shouldGenerateNamespace)

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -622,7 +622,8 @@ namespace CppSharp.Generators.CSharp
 
             while (!(ctx is TranslationUnit))
             {
-                if (!string.IsNullOrWhiteSpace(ctx.Name))
+                var isInlineNamespace = ctx is Namespace && ((Namespace)ctx).IsInline;
+                if (!string.IsNullOrWhiteSpace(ctx.Name) && !isInlineNamespace)
                     names.Push(ctx.Name);
 
                 ctx = ctx.Namespace;

src/Generator/Types/Std/Stdlib.cs

@@ -123,6 +123,8 @@ namespace CppSharp.Types.Std
             var names = new Stack<string>();
             while (!(declContext is TranslationUnit))
             {
+                var isInlineNamespace = declContext is Namespace && ((Namespace)declContext).IsInline;
+                if (!isInlineNamespace)
                     names.Push(declContext.Name);
                 declContext = declContext.Namespace;
             }

tests/Common/Common.Tests.cs

@@ -807,4 +807,10 @@ This is a very long string. This is a very long string. This is a very long stri
             Assert.That(testProperties.RefToPrimitiveInSetter, Is.EqualTo(value));
         }
     }
+
+    [Test]
+    public void TestInlineNamespaces()
+    {
+        Common.FunctionInsideInlineNamespace();
+    }
 }

tests/Common/Common.h

@@ -1361,3 +1361,11 @@ template<typename T> void TemplatedFunction(T type)
 {
 
 }
+
+inline namespace InlineNamespace
+{
+    void FunctionInsideInlineNamespace()
+    {
+        
+    }
+}