Improved the searching for type maps to work with typedefs and selected mapped template specialisations.

This makes it possible to map the exact specialisation of basic_string which corresponds to std::string.
This helps when std::string is used as a placeholder (std::vector<std::string>) since it's then finally resolved to the specialisation and not the typedef.

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

src/Generator/Types/Std/Stdlib.cs

@@ -27,7 +27,7 @@ namespace CppSharp.Types.Std
         }
     }
 
-    [TypeMap("std::string")]
+    [TypeMap("std::basic_string<char, std::char_traits<char>, std::allocator<char>>")]
     public class String : TypeMap
     {
         public override string CLISignature(CLITypePrinterContext ctx)
@@ -112,8 +112,12 @@ namespace CppSharp.Types.Std
 
         private static ClassTemplateSpecialization GetBasicString(Type type)
         {
-            var template = (type.GetFinalPointee() ?? type).Desugar();
-            return ((TemplateSpecializationType) template).GetClassTemplateSpecialization();
+            var desugared = type.Desugar();
+            var template = (desugared.GetFinalPointee() ?? desugared).Desugar();
+            var templateSpecializationType = template as TemplateSpecializationType;
+            if (templateSpecializationType != null)
+                return templateSpecializationType.GetClassTemplateSpecialization();
+            return (ClassTemplateSpecialization) ((TagType) template).Declaration;
         }
     }
 
@@ -382,7 +386,7 @@ namespace CppSharp.Types.Std
         }
     }
 
-    [TypeMap("std::nullptr_t")]
+    [TypeMap("std::nullptr_t", GeneratorKind = GeneratorKind.CLI)]
     public class NullPtr : TypeMap
     {
         public override bool DoesMarshalling { get { return false; } }

src/Generator/Types/TypeMap.cs

@@ -195,6 +195,10 @@ namespace CppSharp.Types
                 return true;
             }
 
+            var typedef = decl as TypedefDecl;
+            if (typedef != null)
+                return FindTypeMap(typedef.Type, out typeMap);
+
             return false;
         }
 
@@ -203,9 +207,15 @@ namespace CppSharp.Types
             var typePrinter = new CppTypePrinter { PrintLogicalNames = true };
 
             var template = type as TemplateSpecializationType;
-            if (template != null && template.Template.TemplatedDecl != null)
-                return FindTypeMap(template.Template.TemplatedDecl, type,
-                    out typeMap);
+            if (template != null)
+            {
+                var specialization = template.GetClassTemplateSpecialization();
+                if (specialization != null && FindTypeMap(specialization, type, out typeMap))
+                    return true;
+                if (template.Template.TemplatedDecl != null)
+                    return FindTypeMap(template.Template.TemplatedDecl, type,
+                        out typeMap);
+            }
 
             if (FindTypeMap(type.Visit(typePrinter), out typeMap))
             {