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  1. #define BANNED(func) sorry_##func##_is_a_banned_function
  2.  
  3. #undef strcpy
  4. #define strcpy(x,y) BANNED(strcpy)
  5.  
  6. int main() {
  7. 	strcpy(NULL, NULL);
  8.  
  9. 	return 0;
  10. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:1:22: error: ‘sorry_strcpy_is_a_banned_function’ was not declared in this scope
 #define BANNED(func) sorry_##func##_is_a_banned_function
                      ^~~~~~
prog.cpp:4:21: note: in expansion of macro ‘BANNED’
 #define strcpy(x,y) BANNED(strcpy)
                     ^~~~~~
prog.cpp:7:2: note: in expansion of macro ‘strcpy’
  strcpy(NULL, NULL);
  ^~~~~~
stdout
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Standard output is empty
https://ideone.com/h0g8F1
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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