c - goto label trick in a macro for condition -

there 1 evil macro trick don't remember , lot this:

public : var = 3; } 

which should expand to

if(route == rooting_public) {     var = 3; } 

how can achieve ?

macros used reduce clutter; though lot of clutter indicates problems program structure.

the op's notion of possible macro not match c-syntax. along lines might be:

#define if_rooted(name) if (rooted_##name & input) { output = e##name; }  #define rooted_first 16 #define rooted_second 64  #define efirst 1 #define esecond 2      if_rooted(first);     if_rooted(second); 

where input , output , repetitive test "clutter" eliminated. making table better way reduce clutter; op asked hint macros.