Perhaps the most commonly used Swift compiler directive is the #if command, which enables us to conditionally include or exclude certain code blocks when our program is being compiled.įor example, we might use that command to check if our app is currently being compiled with its debug build configuration, by checking if the default DEBUG flag is enabled. c source file includes the associated header as does the main. You can declare a function multiple times but it should only be defined once. It is complaining about multiple definitions. int main ( int argc, char argv ) Anyway, if your program has multiple functions named main, the linker wont know which one is supposed to be your program entry point, so it just quits and dies. But your compiler isnt complaining about multiple declarations. Acceptable function signatures (to my knowledge) are: int main () and. This week, let’s take a look at a few of those compiler directives and what sort of situations that each of them might be particularly useful in. It does that by looking for a function named main. Je sais que beaucoup ont ce probleme sur internet mais toutes les raisons et solutions que jai pu trouver ne semblent pas etre les bonnes. However, sometimes we might want to perform certain checks and run other kinds of custom logic when our code is being compiled, and although Swift doesn’t (yet) include a fully-featured macro or preprocessing system, it does ship with a few built-in compiler directives and conditions that enable us to influence the compilation process in various ways. Jaurais toujours comme erreur: l9 multiple definition of chargerNiveau (int () 12) l9 first defined here. Even though Swift has a very strong compile-time focus when it comes to how it verifies and type-checks the code that we write, it’s still primarily used to implement runtime logic.
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