THRIFT-1452 generate a swap() method for all generated structs

fix compiler warnings, when having empty structs

git-svn-id: https://svn.apache.org/repos/asf/thrift/trunk@1212593 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/compiler/cpp/src/generate/t_cpp_generator.cc b/compiler/cpp/src/generate/t_cpp_generator.cc
index 1f542d2..4b7fb7b 100755 (executable)
--- a/compiler/cpp/src/generate/t_cpp_generator.cc
+++ b/compiler/cpp/src/generate/t_cpp_generator.cc
@@ -1526,6 +1526,14 @@ void t_cpp_generator::generate_struct_swap(ofstream& out, t_struct* tstruct) {
       indent() << "swap(a.__isset, b.__isset);" << endl;
   }
 
+  // handle empty structs
+  if (fields.size() == 0) {
+    out <<
+      indent() << "(void) a;" << endl;
+    out <<
+      indent() << "(void) b;" << endl;
+  }
+
   scope_down(out);
   out << endl;
 }