ICE-6897 - Add delegate metadata

The "delegate" metadata tag can be applied to interfaces with one
operation. In C++ they are mapped to std::function's, in C# delegates.
In Java we still generate a interface with one operation, which is
a FunctionalInterface.

1 files changed, 15 insertions, 1 deletions

diff --git a/cpp/src/Slice/CsUtil.cpp b/cpp/src/Slice/CsUtil.cpp
index ac8f3d05e57..d02f8bdfd13 100644
--- a/cpp/src/Slice/CsUtil.cpp
+++ b/cpp/src/Slice/CsUtil.cpp
@@ -1179,7 +1179,7 @@ Slice::CsGenerator::writeSequenceMarshalUnmarshalCode(Output& out,
                                 << "> e__ = " << param << ".GetEnumerator();";
                             out << nl << "while(e__.MoveNext())";
                             out << sb;
-                            string func = (builtin->kind() == Builtin::KindObject || 
+                            string func = (builtin->kind() == Builtin::KindObject ||
                                            builtin->kind() == Builtin::KindValue) ? "writeObject" : "writeProxy";
                             out << nl << stream << '.' << func << "(e__.Current);";
                             out << eb;
@@ -2639,5 +2639,19 @@ Slice::CsGenerator::MetaDataVisitor::validate(const ContainedPtr& cont)
                 _history.insert(s);
             }
         }
+
+        if(_history.count(s) == 0)
+        {
+            if(s == "delegate")
+            {
+                ClassDefPtr cl = ClassDefPtr::dynamicCast(cont);
+                if(cl && cl->isDelegate())
+                {
+                    continue;
+                }
+                emitWarning(cont->file(), cont->line(), msg + " `" + s + "'");
+                _history.insert(s);
+            }
+        }
     }
 }