The best example I have seen ispirato il seguente esempio (eseguibile), che sblocca ogni sorta di possibilità Freaky per l'introspezione incrinato-out ...
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#define typename(x) _Generic((x), /* Get the name of a type */ \
\
_Bool: "_Bool", unsigned char: "unsigned char", \
char: "char", signed char: "signed char", \
short int: "short int", unsigned short int: "unsigned short int", \
int: "int", unsigned int: "unsigned int", \
long int: "long int", unsigned long int: "unsigned long int", \
long long int: "long long int", unsigned long long int: "unsigned long long int", \
float: "float", double: "double", \
long double: "long double", char *: "pointer to char", \
void *: "pointer to void", int *: "pointer to int", \
default: "other")
#define fmt "%20s is '%s'\n"
int main() {
size_t s; ptrdiff_t p; intmax_t i; int ai[3] = {0}; return printf(fmt fmt fmt fmt fmt fmt fmt fmt,
"size_t", typename(s), "ptrdiff_t", typename(p),
"intmax_t", typename(i), "character constant", typename('0'),
"0x7FFFFFFF", typename(0x7FFFFFFF), "0xFFFFFFFF", typename(0xFFFFFFFF),
"0x7FFFFFFFU", typename(0x7FFFFFFFU), "array of int", typename(ai));
}
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═════════════════╣ Amazeballs... ╠═════════════════════════════════════
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size_t is 'unsigned long int'
ptrdiff_t is 'long int'
intmax_t is 'long int'
character constant is 'int'
0x7FFFFFFF is 'int'
0xFFFFFFFF is 'unsigned int'
0x7FFFFFFFU is 'unsigned int'
array of int is 'other'
fonte
2013-06-25 06:19:45
È possibile leggere o scarica una [bozza dello standard C11] (http://www.open-std.org/JTC1/sc22/wg14/www/docs/n1570.pdf) (versione PDF). Ha un esempio nella sezione 6.5.1.1. – pmg
Non esiste una cosa come "generici" in C++. – Griwes
@Griwes ecco qui. altro pignolo? – ApprenticeHacker