100 lines
3.6 KiB
Modula-2
100 lines
3.6 KiB
Modula-2
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/*
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* libjingle
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* Copyright 2012, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// This file is a supermacro
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// (see http://wanderinghorse.net/computing/papers/supermacros_cpp.html) to
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// expand a declaration of a late-binding symbol table class.
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//
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// Arguments:
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// LATE_BINDING_SYMBOL_TABLE_CLASS_NAME: Name of the class to generate.
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// LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST: List of symbols to load from the DLL,
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// as an X-Macro list (see http://www.drdobbs.com/blogs/cpp/228700289).
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//
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// From a .h file, include the header(s) for the DLL to late-bind and the
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// latebindingsymboltable.h header, and then call this supermacro (optionally
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// from inside the namespace for the class to generate, if any). Example:
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//
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// #include <headerfordll.h>
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//
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// #include "talk/base/latebindingsymboltable.h"
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//
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// namespace foo {
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//
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// #define MY_CLASS_NAME DesiredClassName
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// #define MY_SYMBOLS_LIST X(acos) X(sin) X(tan)
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//
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// #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME MY_CLASS_NAME
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// #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST MY_SYMBOLS_LIST
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// #include "talk/base/latebindingsymboltable.h.def"
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//
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// }
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#ifndef TALK_BASE_LATEBINDINGSYMBOLTABLE_H_
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#error You must first include latebindingsymboltable.h
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#endif
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#ifndef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
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#error You must define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
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#endif
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#ifndef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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#error You must define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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#endif
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class LATE_BINDING_SYMBOL_TABLE_CLASS_NAME :
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public ::talk_base::LateBindingSymbolTable {
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public:
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LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
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~LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
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#define X(sym) \
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typeof(&::sym) sym() const { \
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ASSERT(::talk_base::LateBindingSymbolTable::IsLoaded()); \
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return reinterpret_cast<typeof(&::sym)>(table_[SYMBOL_TABLE_INDEX_##sym]); \
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}
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LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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#undef X
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private:
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enum {
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#define X(sym) \
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SYMBOL_TABLE_INDEX_##sym,
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LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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#undef X
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SYMBOL_TABLE_SIZE
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};
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static const ::talk_base::LateBindingSymbolTable::TableInfo kTableInfo;
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void *table_[SYMBOL_TABLE_SIZE];
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DISALLOW_COPY_AND_ASSIGN(LATE_BINDING_SYMBOL_TABLE_CLASS_NAME);
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};
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#undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
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#undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
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