henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 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 | |
| 51 | class 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 | } |
| 62 | LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |
| 63 | #undef X |
| 64 | |
| 65 | private: |
| 66 | enum { |
| 67 | #define X(sym) \ |
| 68 | SYMBOL_TABLE_INDEX_##sym, |
| 69 | LATE_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 |