ui/base/glib/glib_signal.h

// 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 UI_BASE_GLIB_GLIB_SIGNAL_H_
#define UI_BASE_GLIB_GLIB_SIGNAL_H_

typedef void* gpointer;

// At the time of writing this, there were two common ways of binding our C++
// code to the gobject C system. We either defined a whole bunch of "static
// MethodThunk()" which just called nonstatic Method()s on a class (which hurt
// readability of the headers and signal connection code) OR we declared
// "static Method()" and passed in the current object as the gpointer (and hurt
// readability in the implementation by having "context->" before every
// variable).

// The hopeful result of using these macros is that the code will be more
// readable and regular. There shouldn't be a bunch of static Thunks visible in
// the headers and the implementations shouldn't be filled with "context->"
// de-references.

#define CHROMEG_CALLBACK_0(CLASS, RETURN, METHOD, SENDER)         \
  static RETURN METHOD##Thunk(SENDER sender, gpointer userdata) { \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender);    \
  }                                                               \
                                                                  \
  RETURN METHOD(SENDER)

#define CHROMEG_CALLBACK_1(CLASS, RETURN, METHOD, SENDER, ARG1)             \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, gpointer userdata) { \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one);         \
  }                                                                         \
                                                                            \
  RETURN METHOD(SENDER, ARG1)

#define CHROMEG_CALLBACK_2(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2)    \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two,         \
                              gpointer userdata) {                       \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two); \
  }                                                                      \
                                                                         \
  RETURN METHOD(SENDER, ARG1, ARG2)

#define CHROMEG_CALLBACK_3(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3)  \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three, \
                              gpointer userdata) {                           \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two,      \
                                                      three);                \
  }                                                                          \
                                                                             \
  RETURN METHOD(SENDER, ARG1, ARG2, ARG3)

#define CHROMEG_CALLBACK_4(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3,    \
                           ARG4)                                               \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, gpointer userdata) {                  \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four);                   \
  }                                                                            \
                                                                               \
  RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4)

#define CHROMEG_CALLBACK_5(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3,    \
                           ARG4, ARG5)                                         \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, ARG5 five, gpointer userdata) {       \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four, five);             \
  }                                                                            \
                                                                               \
  RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5)

#define CHROMEG_CALLBACK_6(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, ARG3,    \
                           ARG4, ARG5, ARG6)                                   \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, ARG5 five, ARG6 six,                  \
                              gpointer userdata) {                             \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four, five, six);        \
  }                                                                            \
                                                                               \
  RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6)

#define CHROMEG_VIRTUAL_CALLBACK_0(CLASS, RETURN, METHOD, SENDER) \
  static RETURN METHOD##Thunk(SENDER sender, gpointer userdata) { \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender);    \
  }                                                               \
                                                                  \
  virtual RETURN METHOD(SENDER)

#define CHROMEG_VIRTUAL_CALLBACK_1(CLASS, RETURN, METHOD, SENDER, ARG1)     \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, gpointer userdata) { \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one);         \
  }                                                                         \
                                                                            \
  virtual RETURN METHOD(SENDER, ARG1)

#define CHROMEG_VIRTUAL_CALLBACK_2(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2) \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two,              \
                              gpointer userdata) {                            \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two);      \
  }                                                                           \
                                                                              \
  virtual RETURN METHOD(SENDER, ARG1, ARG2)

#define CHROMEG_VIRTUAL_CALLBACK_3(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2, \
                                   ARG3)                                      \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,  \
                              gpointer userdata) {                            \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two,       \
                                                      three);                 \
  }                                                                           \
                                                                              \
  virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3)

#define CHROMEG_VIRTUAL_CALLBACK_4(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2,  \
                                   ARG3, ARG4)                                 \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, gpointer userdata) {                  \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four);                   \
  }                                                                            \
                                                                               \
  virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4)

#define CHROMEG_VIRTUAL_CALLBACK_5(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2,  \
                                   ARG3, ARG4, ARG5)                           \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, ARG5 five, gpointer userdata) {       \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four, five);             \
  }                                                                            \
                                                                               \
  virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5)

#define CHROMEG_VIRTUAL_CALLBACK_6(CLASS, RETURN, METHOD, SENDER, ARG1, ARG2,  \
                                   ARG3, ARG4, ARG5, ARG6)                     \
  static RETURN METHOD##Thunk(SENDER sender, ARG1 one, ARG2 two, ARG3 three,   \
                              ARG4 four, ARG5 five, ARG6 six,                  \
                              gpointer userdata) {                             \
    return reinterpret_cast<CLASS*>(userdata)->METHOD(sender, one, two, three, \
                                                      four, five, six);        \
  }                                                                            \
                                                                               \
  virtual RETURN METHOD(SENDER, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6)

#endif