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+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright 2005-2010 Google, Inc.
+// Author: jpr@google.com (Jake Ratkiewicz)
+
+// Convenience templates for defining arg packs for the FstClass operations.
+
+// See operation-templates.h for a discussion about why these are needed; the
+// short story is that all FstClass operations must be implemented by a version
+// that takes one argument, most likely a struct bundling all the
+// logical arguments together. These template structs provide convenient ways
+// to specify these bundles (e.g. by means of appropriate typedefs).
+
+// The ArgPack template is sufficient for bundling together all the args for
+// a particular function. The function is assumed to be void-returning. If
+// you want a space for a return value, use the WithReturnValue template
+// as follows:
+
+// WithReturnValue<bool, ArgPack<...> >
+
+#ifndef FST_SCRIPT_ARG_PACKS_H_
+#define FST_SCRIPT_ARG_PACKS_H_
+
+namespace fst {
+namespace script {
+namespace args {
+
+// Sentinel value that means "no arg here."
+class none_type { };
+
+// Base arg pack template class. Specializations follow that allow
+// fewer numbers of arguments (down to 2). If the maximum number of arguments
+// increases, you will need to change three things:
+//   1) Add more template parameters to this template
+//   2) Add more specializations to allow fewer numbers of parameters than
+//      the new max.
+//   3) Add extra none_types to all existing specializations to fill
+//      the new slots.
+
+
+// 9 args (max)
+template<class T1,
+         class T2 = none_type,
+         class T3 = none_type,
+         class T4 = none_type,
+         class T5 = none_type,
+         class T6 = none_type,
+         class T7 = none_type,
+         class T8 = none_type,
+         class T9 = none_type>
+struct Package {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+  T5 arg5;
+  T6 arg6;
+  T7 arg7;
+  T8 arg8;
+  T9 arg9;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6,
+          T7 arg7, T8 arg8, T9 arg9) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4), arg5(arg5),
+      arg6(arg6), arg7(arg7), arg8(arg8), arg9(arg9) { }
+};
+
+// 8 args
+template<class T1,
+         class T2,
+         class T3,
+         class T4,
+         class T5,
+         class T6,
+         class T7,
+         class T8>
+struct Package<T1, T2, T3, T4, T5, T6, T7, T8, none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+  T5 arg5;
+  T6 arg6;
+  T7 arg7;
+  T8 arg8;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6,
+          T7 arg7, T8 arg8) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4), arg5(arg5),
+      arg6(arg6), arg7(arg7), arg8(arg8) { }
+};
+
+// 7 args
+template<class T1,
+         class T2,
+         class T3,
+         class T4,
+         class T5,
+         class T6,
+         class T7>
+struct Package<T1, T2, T3, T4, T5, T6, T7,
+               none_type, none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+  T5 arg5;
+  T6 arg6;
+  T7 arg7;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6,
+          T7 arg7) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4), arg5(arg5),
+      arg6(arg6), arg7(arg7) { }
+};
+
+// 6 args
+template<class T1,
+         class T2,
+         class T3,
+         class T4,
+         class T5,
+         class T6>
+struct Package<T1, T2, T3, T4, T5, T6, none_type,
+               none_type, none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+  T5 arg5;
+  T6 arg6;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4), arg5(arg5),
+      arg6(arg6) { }
+};
+
+// 5 args
+template<class T1,
+         class T2,
+         class T3,
+         class T4,
+         class T5>
+struct Package<T1, T2, T3, T4, T5, none_type, none_type,
+               none_type, none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+  T5 arg5;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4), arg5(arg5) { }
+};
+
+// 4 args
+template<class T1,
+         class T2,
+         class T3,
+         class T4>
+struct Package<T1, T2, T3, T4, none_type, none_type,
+               none_type, none_type, none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+  T4 arg4;
+
+  Package(T1 arg1, T2 arg2, T3 arg3, T4 arg4) :
+      arg1(arg1), arg2(arg2), arg3(arg3), arg4(arg4) { }
+};
+
+// 3 args
+template<class T1,
+         class T2,
+         class T3>
+struct Package<T1, T2, T3, none_type, none_type,
+               none_type, none_type, none_type,
+               none_type> {
+  T1 arg1;
+  T2 arg2;
+  T3 arg3;
+
+  Package(T1 arg1, T2 arg2, T3 arg3) :
+      arg1(arg1), arg2(arg2), arg3(arg3) { }
+};
+
+// 2 args (minimum)
+template<class T1,
+         class T2>
+struct Package<T1, T2, none_type, none_type,
+               none_type, none_type, none_type,
+               none_type, none_type> {
+  T1 arg1;
+  T2 arg2;
+
+  Package(T1 arg1, T2 arg2) :
+      arg1(arg1), arg2(arg2) { }
+};
+
+// Tack this on to an existing arg pack to add a return value.
+// The syntax for accessing the args is then slightly more stilted,
+// as you must do an extra member access (since the args are stored
+// as a member of this class).
+// The alternative is to declare another slew of templates for functions
+// that return a value, analogous to the above.
+
+template<class Retval, class ArgPackage>
+struct WithReturnValue {
+  Retval retval;
+  const ArgPackage &args;
+
+  explicit WithReturnValue(const ArgPackage &args) : args(args) { }
+};
+
+// We don't want to store a reference to a reference, if ArgPackage is
+// already some reference type.
+template<class Retval, class ArgPackage>
+struct WithReturnValue<Retval, ArgPackage&> {
+  Retval retval;
+  const ArgPackage &args;
+
+  explicit WithReturnValue(const ArgPackage &args) : args(args) { }
+};
+
+}  // namespace args
+}  // namespace script
+}  // namespace fst
+
+#endif  // FST_SCRIPT_ARG_PACKS_H_