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28 // This file is a supermacro
29 // (see http://wanderinghorse.net/computing/papers/supermacros_cpp.html) to
30 // expand a declaration of a late-binding symbol table class.
33 // LATE_BINDING_SYMBOL_TABLE_CLASS_NAME: Name of the class to generate.
34 // LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST: List of symbols to load from the DLL,
35 // as an X-Macro list (see http://www.drdobbs.com/blogs/cpp/228700289).
37 // From a .h file, include the header(s) for the DLL to late-bind and the
38 // latebindingsymboltable.h header, and then call this supermacro (optionally
39 // from inside the namespace for the class to generate, if any). Example:
41 // #include <headerfordll.h>
43 // #include "talk/base/latebindingsymboltable.h"
47 // #define MY_CLASS_NAME DesiredClassName
48 // #define MY_SYMBOLS_LIST X(acos) X(sin) X(tan)
50 // #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME MY_CLASS_NAME
51 // #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST MY_SYMBOLS_LIST
52 // #include "talk/base/latebindingsymboltable.h.def"
56 #ifndef TALK_BASE_LATEBINDINGSYMBOLTABLE_H_
57 #error You must first include latebindingsymboltable.h
60 #ifndef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
61 #error You must define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
64 #ifndef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
65 #error You must define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
68 class LATE_BINDING_SYMBOL_TABLE_CLASS_NAME :
69 public ::talk_base::LateBindingSymbolTable {
71 LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
72 ~LATE_BINDING_SYMBOL_TABLE_CLASS_NAME();
75 typeof(&::sym) sym() const { \
76 ASSERT(::talk_base::LateBindingSymbolTable::IsLoaded()); \
77 return reinterpret_cast<typeof(&::sym)>(table_[SYMBOL_TABLE_INDEX_##sym]); \
79 LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
85 SYMBOL_TABLE_INDEX_##sym,
86 LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST
91 static const ::talk_base::LateBindingSymbolTable::TableInfo kTableInfo;
93 void *table_[SYMBOL_TABLE_SIZE];
95 DISALLOW_COPY_AND_ASSIGN(LATE_BINDING_SYMBOL_TABLE_CLASS_NAME);
98 #undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME
99 #undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST