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Page history last edited by Kenneth Finnegan 15 years, 7 months ago

This preprocessor directive can be used to make a file not compile with your own error message saying what's wrong, or just cause a warning to be displayed.



#error "Custom error message saying what is wrong"


#warning "Custom warning message"



int foo(int i) {

     #error "Function foo not yet implemented"



int bar(int j) {

     #warning "Function bar may not behave as expected all the time"




This could be used with #if to check properties of the environment

#if sizeof(int) < 4

     #error sizeof Int is too small, must be at least 4 bytes





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