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c11_generic_expression.c revision 1.1 
      1 /*	$NetBSD: c11_generic_expression.c,v 1.1 2021/06/27 18:48:45 rillig Exp $	*/
      2 # 3 "c11_generic_expression.c"
      3 
      4 /*
      5  * C99 added support for type-generic macros, but these were limited to the
      6  * header <tgmath.h>.  C11 made this feature generally available.
      7  *
      8  * The generic selection is typically used with macros, but since lint1 works
      9  * on the preprocessed source, the test cases look a bit strange.
     10  *
     11  * C99 6.5.1.1 "Generic selection"
     12  */
     13 
     14 /* lint1-extra-flags: -Ac11 */
     15 
     16 /*
     17  * The type of 'var' is not compatible with any of the types from the
     18  * generic-association.  This is a compile-time error.
     19  */
     20 const char *
     21 classify_integer_without_default(double var)
     22 {
     23 	return _Generic(var,
     24 	    long double: "long double",
     25 	    long long: "long long",
     26 	    unsigned: "unsigned"
     27 	);
     28 	/* expect-7: argument 'var' unused */
     29 	/* expect-2: type mismatch (pointer to const char) and (double) *//* FIXME */
     30 }
     31 
     32 /*
     33  * In this case, the 'default' expression is selected.
     34  */
     35 const char *
     36 classify_integer_with_default(double var)
     37 {
     38 	return _Generic(var,
     39 	    long double: "long double",
     40 	    long long: "long long",
     41 	    unsigned: "unsigned",
     42 	    default: "unknown"
     43 	);
     44 	/* expect-8: argument 'var' unused */
     45 	/* expect-2: type mismatch (pointer to const char) and (double) *//* FIXME */
     46 }
     47