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 DECLARE_MY_RUNTIME_TYPEINFO \
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; }
29 #define VIRTUAL_COPY_CONS(T, R)\
30 virtual R *clone() const { return new T(*this); } \
31 int yet_another_stupid_function_to_allow_semicolon()
34 #define DECLARE_VIRTUAL_COPY_CONS(T,R)\
35 virtual R *clone() const
36 #define IMPLEMENT_VIRTUAL_COPY_CONS(T,R)\
37 R *T::clone() const { return new T(*this); } \
39 #define IMPLEMENT_IS_TYPE_B(D) \
40 IMPLEMENT_STATIC_NAME(D)\
41 bool D::static_is_type_b(const char *s) \
43 return s == static_name(); \
46 #define IMPLEMENT_IS_TYPE_B1(D,B) \
47 IMPLEMENT_STATIC_NAME(D)\
48 bool D::static_is_type_b(const char *s) \
50 return s == static_name() || B::static_is_type_b(s); \
52 #define IMPLEMENT_IS_TYPE_B2(D, BA, BB) \
53 IMPLEMENT_STATIC_NAME(D)\
54 bool D::static_is_type_b(const char *s) \
56 return s == static_name() || BA::static_is_type_b(s) || BB::static_is_type_b(s); \