2 virtual-methods.hh -- declare
4 source file of the Flower Library
6 (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
10 #ifndef VIRTUAL_METHODS_HH
11 #define VIRTUAL_METHODS_HH
13 /** a macro to declare the classes name as a static and virtual function.
14 The static_name() can *not* be inlined (this might have the effect that
15 s->name() != S::static_name(). Overlapping strings need not be merged in C++
17 #define NAME_MEMBERS() \
18 static char const *static_name();\
19 static bool static_is_type_b(const char*s);\
20 virtual bool is_type_b(const char *s)const { return static_is_type_b(s); } \
21 virtual char const *name() const{ return static_name(); } \
22 int a_stupid_nonexistent_function_to_allow_the_semicolon_come_out()
24 #define IMPLEMENT_STATIC_NAME(c)\
25 char const *c::static_name() { return #c; }
27 #define VIRTUAL_COPY_CONS(T, R)\
28 virtual R *clone() const { return new T(*this); } \
29 int yet_another_stupid_function_to_allow_semicolon()
31 #define IMPLEMENT_IS_TYPE_B(D) \
32 IMPLEMENT_STATIC_NAME(D)\
33 bool D::static_is_type_b(const char *s) \
35 return s == static_name(); \
38 #define IMPLEMENT_IS_TYPE_B1(D,B) \
39 IMPLEMENT_STATIC_NAME(D)\
40 bool D::static_is_type_b(const char *s) \
42 return s == static_name() || B::static_is_type_b(s); \
44 #define IMPLEMENT_IS_TYPE_B2(D, BA, BB) \
45 IMPLEMENT_STATIC_NAME(D)\
46 bool D::static_is_type_b(const char *s) \
48 return s == static_name() || BA::static_is_type_b(s) || BB::static_is_type_b(s); \