blob: bc6396b1f070679940020c4e5565845647a194a4 [file] [log] [blame]
/*
* Copyright 2012 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// This file is a supermacro
// (see http://wanderinghorse.net/computing/papers/supermacros_cpp.html) to
// expand a declaration of a late-binding symbol table class.
//
// Arguments:
// LATE_BINDING_SYMBOL_TABLE_CLASS_NAME: Name of the class to generate.
// LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST: List of symbols to load from the DLL,
// as an X-Macro list (see http://www.drdobbs.com/blogs/cpp/228700289).
//
// From a .h file, include the header(s) for the DLL to late-bind and the
// latebindingsymboltable.h header, and then call this supermacro (optionally
// from inside the namespace for the class to generate, if any). Example:
//
// #include <headerfordll.h>
//
// #include "webrtc/base/latebindingsymboltable.h"
//
// namespace foo {
//
// #define MY_CLASS_NAME DesiredClassName
// #define MY_SYMBOLS_LIST X(acos) X(sin) X(tan)
//
// #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME MY_CLASS_NAME
// #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST MY_SYMBOLS_LIST
// #include "webrtc/base/latebindingsymboltable.h.def"
//
// }
#ifndef WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_
#error You must first include latebindingsymboltable.h
#endif
#ifndef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
#error You must define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
#endif
#ifndef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
#error You must define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
#endif
class LATE_BINDING_SYMBOL_TABLE_CLASS_NAME :
public ::rtc::LateBindingSymbolTable {
public:
LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
~LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
#define X(sym) \
typeof(&::sym) sym() const { \
ASSERT(::rtc::LateBindingSymbolTable::IsLoaded()); \
return reinterpret_cast<typeof(&::sym)>(table_[SYMBOL_TABLE_INDEX_##sym]); \
}
LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
#undef X
private:
enum {
#define X(sym) \
SYMBOL_TABLE_INDEX_##sym,
LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
#undef X
SYMBOL_TABLE_SIZE
};
static const ::rtc::LateBindingSymbolTable::TableInfo kTableInfo;
static const char *const kSymbolNames[];
void *table_[SYMBOL_TABLE_SIZE];
RTC_DISALLOW_COPY_AND_ASSIGN(LATE_BINDING_SYMBOL_TABLE_CLASS_NAME);
};
#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST