Merge pull request #2361 from TurkeyMan/getLinkage_class

Update getLinkage
merged-on-behalf-of: Mike Franklin <JinShil@users.noreply.github.com>

Author: dlang-bot

spec/traits.dd

@@ -600,8 +600,8 @@ pragma(msg, __traits(getFunctionAttributes, (int x) @trusted { return x * 2; }))
 
 $(H2 $(GNAME getLinkage))
 
-        $(P Takes one argument, which is a declaration symbol, or the type of a function,
-        delegate, or pointer to function.
+        $(P Takes one argument, which is a declaration symbol, or the type of a function, delegate,
+        pointer to function, class, or interface.
         Returns a string representing the $(LINK2 attribute.html#LinkageAttribute, LinkageAttribute)
         of the declaration.
         The string is one of:
@@ -623,6 +623,12 @@ alias aliasc = fooc;
 
 static assert(__traits(getLinkage, fooc) == "C");
 static assert(__traits(getLinkage, aliasc) == "C");
+
+extern (C++) class FooCPP {}
+extern (C++) interface FooCPPInterface {}
+
+static assert(__traits(getLinkage, FooCPP) == "C++");
+static assert(__traits(getLinkage, FooCPPInterface) == "C++");
 ---
 
 $(H2 $(GNAME getMember))