[preprocessor] different macro expansion depending on whether its argument is defined or not?
16 Oct
2009
16 Oct
'09
10:36 a.m.
Hi, is it possible to write a preprocessor macro which takes one argument and which expands differently depending on whether the argument is defined or not? Boost solution preferred. Example: #define FOO #undef BAR MY_MACRO(FOO) expands to 1 MY_MACRO(BAR) expands to 0 Kind regards Ingolf
16 Oct
16 Oct
7:05 p.m.
New subject: [preprocessor] different macro expansion depending onwhether its argument is defined or not?
Hi,
is it possible to write a preprocessor macro which takes one argument and which expands differently depending on whether the argument is defined or not? Boost solution preferred.
Example:
#define FOO #undef BAR
MY_MACRO(FOO) expands to 1 MY_MACRO(BAR) expands to 0
Kind regards Ingolf
No, I'm afraid not.
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Ingolf Steinbach -
Pete Bartlett