Unified callback system.

base/bind.h

Index: base/bind.h
diff --git a/base/bind.h b/base/bind.h
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+// This file was GENERATED by command:
+//     pump.py bind.h.pump
+// DO NOT EDIT BY HAND!!!
+
+
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_BIND_H_
+#define BASE_BIND_H_
+#pragma once
+
+#include "base/bind_internal.h"
+#include "base/callback_helpers.h"
+
+// See base/callback.h for how to use these functions.
+//
+// IMPLEMENTATION NOTE
+// Though Bind()'s result is meant to be stored in a Callback<> type, it
+// cannot actually return the exact type without requiring a large amount
+// of extra template specializations. The problem is that in order to
+// discern the correct specialization of Callback<>, Bind would need to
+// unwrap the function signature to determine the signature's arity, and
+// whether or not it is a method.
+//
+// Each unique combination of (arity, function_type, num_prebound) where
+// function_type is one of {function, method, const_method} would require
+// one specialization.  We eventually have to do a similar number of
+// specializations anyways in the implementation (see the FunctionTraitsN,
+// classes).  However, it is avoidable in Bind if we return the result
+// via an indirection like we do below.
+
+namespace base {
+
+template <typename Sig>
+internal::InvokerStorageHolder<internal::InvokerStorage0<Sig> >
+Bind(Sig f) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage0<Sig>(f));
+}
+
+template <typename Sig, typename P1>
+internal::InvokerStorageHolder<internal::InvokerStorage1<Sig,P1> >
+Bind(Sig f, const P1& p1) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage1<Sig, P1>(
+          f, p1));
+}
+
+template <typename Sig, typename P1, typename P2>
+internal::InvokerStorageHolder<internal::InvokerStorage2<Sig,P1, P2> >
+Bind(Sig f, const P1& p1, const P2& p2) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage2<Sig, P1, P2>(
+          f, p1, p2));
+}
+
+template <typename Sig, typename P1, typename P2, typename P3>
+internal::InvokerStorageHolder<internal::InvokerStorage3<Sig,P1, P2, P3> >
+Bind(Sig f, const P1& p1, const P2& p2, const P3& p3) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage3<Sig, P1, P2, P3>(
+          f, p1, p2, p3));
+}
+
+template <typename Sig, typename P1, typename P2, typename P3, typename P4>
+internal::InvokerStorageHolder<internal::InvokerStorage4<Sig,P1, P2, P3, P4> >
+Bind(Sig f, const P1& p1, const P2& p2, const P3& p3, const P4& p4) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage4<Sig, P1, P2, P3, P4>(
+          f, p1, p2, p3, p4));
+}
+
+template <typename Sig, typename P1, typename P2, typename P3, typename P4,
+    typename P5>
+internal::InvokerStorageHolder<internal::InvokerStorage5<Sig,P1, P2, P3, P4,
+    P5> >
+Bind(Sig f, const P1& p1, const P2& p2, const P3& p3, const P4& p4,
+    const P5& p5) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage5<Sig, P1, P2, P3, P4, P5>(
+          f, p1, p2, p3, p4, p5));
+}
+
+template <typename Sig, typename P1, typename P2, typename P3, typename P4,
+    typename P5, typename P6>
+internal::InvokerStorageHolder<internal::InvokerStorage6<Sig,P1, P2, P3, P4,
+    P5, P6> >
+Bind(Sig f, const P1& p1, const P2& p2, const P3& p3, const P4& p4,
+    const P5& p5, const P6& p6) {
+  return internal::MakeInvokerStorageHolder(
+      new internal::InvokerStorage6<Sig, P1, P2, P3, P4, P5, P6>(
+          f, p1, p2, p3, p4, p5, p6));
+}
+
+}  // namespace base
+
+#endif  // BASE_BIND_H_