1/* 2 * Copyright 2012 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11// This file is a supermacro 12// (see http://wanderinghorse.net/computing/papers/supermacros_cpp.html) to 13// expand a declaration of a late-binding symbol table class. 14// 15// Arguments: 16// LATE_BINDING_SYMBOL_TABLE_CLASS_NAME: Name of the class to generate. 17// LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST: List of symbols to load from the DLL, 18// as an X-Macro list (see http://www.drdobbs.com/blogs/cpp/228700289). 19// 20// From a .h file, include the header(s) for the DLL to late-bind and the 21// latebindingsymboltable.h header, and then call this supermacro (optionally 22// from inside the namespace for the class to generate, if any). Example: 23// 24// #include <headerfordll.h> 25// 26// #include "webrtc/base/latebindingsymboltable.h" 27// 28// namespace foo { 29// 30// #define MY_CLASS_NAME DesiredClassName 31// #define MY_SYMBOLS_LIST X(acos) X(sin) X(tan) 32// 33// #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME MY_CLASS_NAME 34// #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST MY_SYMBOLS_LIST 35// #include "webrtc/base/latebindingsymboltable.h.def" 36// 37// } 38 39#ifndef WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_ 40#error You must first include latebindingsymboltable.h 41#endif 42 43#ifndef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME 44#error You must define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME 45#endif 46 47#ifndef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 48#error You must define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 49#endif 50 51class LATE_BINDING_SYMBOL_TABLE_CLASS_NAME : 52 public ::rtc::LateBindingSymbolTable { 53 public: 54 LATE_BINDING_SYMBOL_TABLE_CLASS_NAME(); 55 ~LATE_BINDING_SYMBOL_TABLE_CLASS_NAME(); 56 57#define X(sym) \ 58 typeof(&::sym) sym() const { \ 59 ASSERT(::rtc::LateBindingSymbolTable::IsLoaded()); \ 60 return reinterpret_cast<typeof(&::sym)>(table_[SYMBOL_TABLE_INDEX_##sym]); \ 61 } 62LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 63#undef X 64 65 private: 66 enum { 67#define X(sym) \ 68 SYMBOL_TABLE_INDEX_##sym, 69LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 70#undef X 71 SYMBOL_TABLE_SIZE 72 }; 73 74 static const ::rtc::LateBindingSymbolTable::TableInfo kTableInfo; 75 static const char *const kSymbolNames[]; 76 77 void *table_[SYMBOL_TABLE_SIZE]; 78 79 DISALLOW_COPY_AND_ASSIGN(LATE_BINDING_SYMBOL_TABLE_CLASS_NAME); 80}; 81 82#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME 83#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST 84