Ensured symbols for templates instantiating pointers or references.

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

src/Generator/Driver.cs

@@ -253,8 +253,12 @@ namespace CppSharp
             TranslationUnitPasses.AddPass(new ResolveIncompleteDeclsPass());
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
 
-            if (Options.IsCSharpGenerator && Options.GenerateInlines)
+            if (Options.IsCSharpGenerator)
+            {
+                if (Options.GenerateInlines)
                     TranslationUnitPasses.AddPass(new GenerateInlinesCodePass());
+                TranslationUnitPasses.AddPass(new GenerateTemplatesCodePass());
+            }
 
             library.SetupPasses(this);
 

src/Generator/Options.cs

@@ -150,7 +150,6 @@ namespace CppSharp
 
         public Encoding Encoding { get; set; }
 
-        private string inlinesLibraryName;
         public string InlinesLibraryName
         {
             get
@@ -164,6 +163,19 @@ namespace CppSharp
             set { inlinesLibraryName = value; }
         }
 
+        public string TemplatesLibraryName
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(templatesLibraryName))
+                {
+                    return string.Format("{0}-templates", OutputNamespace);
+                }
+                return templatesLibraryName;
+            }
+            set { templatesLibraryName = value; }
+        }
+
         public bool IsCSharpGenerator
         {
             get { return GeneratorKind == GeneratorKind.CSharp; }
@@ -193,6 +205,9 @@ namespace CppSharp
         /// C# end only: force patching of the virtual entries of the functions in this list.
         /// </summary>
         public List<string> ExplicitlyPatchedVirtualFunctions { get; private set; }
+
+        private string inlinesLibraryName;
+        private string templatesLibraryName;
     }
 
     public class InvalidOptionException : Exception

src/Generator/Passes/GenerateInlinesCodePass.cs

@@ -8,7 +8,6 @@ namespace CppSharp.Passes
     {
         public override bool VisitLibrary(ASTContext context)
         {
-            Directory.CreateDirectory(Driver.Options.OutputDir);
             WriteInlinesIncludes();
             return true;
         }
@@ -19,6 +18,7 @@ namespace CppSharp.Passes
             foreach (var header in Driver.Options.Headers)
                 cppBuilder.AppendFormat("#include <{0}>\n", header);
             var cpp = string.Format("{0}.cpp", Driver.Options.InlinesLibraryName);
+            Directory.CreateDirectory(Driver.Options.OutputDir);
             var path = Path.Combine(Driver.Options.OutputDir, cpp);
             File.WriteAllText(path, cppBuilder.ToString());
         }

src/Generator/Passes/GenerateTemplatesCodePass.cs

@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using CppSharp.AST;
+using CppSharp.AST.Extensions;
+using CppSharp.Types;
+
+namespace CppSharp.Passes
+{
+    public class GenerateTemplatesCodePass : TranslationUnitPass
+    {
+        public override bool VisitLibrary(ASTContext context)
+        {
+            base.VisitLibrary(context);
+            WriteTemplateInstantiations();
+            return true;
+        }
+
+        public override bool VisitTemplateSpecializationType(TemplateSpecializationType template, TypeQualifiers quals)
+        {
+            if (AlreadyVisited(template) || template.Template.Access == AccessSpecifier.Private)
+                return false;
+
+            if (template.Arguments.Select(a => a.Type.Type.Desugar()).All(t => t.IsAddress() && !t.GetFinalPointee().IsDependent))
+            {
+                var cppTypePrinter = new CppTypePrinter { PrintScopeKind = CppTypePrintScopeKind.Qualified };
+                templateInstantiations.Add(string.Format("{0}<{1}>", template.Template.Name,
+                    string.Join(", ", template.Arguments.Select(a => a.Type.Type.Visit(cppTypePrinter)))));
+            }
+
+            return true;
+        }
+
+        private void WriteTemplateInstantiations()
+        {
+            var cppBuilder = new StringBuilder();
+            foreach (var header in Driver.Options.Headers)
+                cppBuilder.AppendFormat("#include <{0}>\n", header);
+            foreach (var templateInstantiation in templateInstantiations)
+                cppBuilder.AppendFormat("\ntemplate class {0};", templateInstantiation);
+            var cpp = string.Format("{0}.cpp", Driver.Options.TemplatesLibraryName);
+            Directory.CreateDirectory(Driver.Options.OutputDir);
+            var path = Path.Combine(Driver.Options.OutputDir, cpp);
+            File.WriteAllText(path, cppBuilder.ToString());
+        }
+
+        private HashSet<string> templateInstantiations = new HashSet<string>();
+    }
+}