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#include <stdio.h>
#include <stdint.h>
 
void FooBar_U32(uint32_t x);
void FooBar_DBL(double x);
 
#define FooBar(x) _Generic((x), uint32_t: FooBar_U32,\
                                double:   FooBar_DBL)(x)
 
int main(void)
{
    uint16_t foo = 232;  // Variable foo is 16-bit unsigned
    FooBar(foo);         // Try to promote a 16-bit to 32-bit value for FooBar_U32
 
    float nib = 3.14;
    FooBar(nib);  // Try to promote a float to a double for FooBar_DBL
}
 
void FooBar_U32(uint32_t x)
{
	printf("unsigned 32\n");
}
 
void FooBar_DBL(double x)
{
	printf("Double\n");
}

prog.c: In function ‘main’:
prog.c:7:28: error: ‘_Generic’ selector of type ‘short unsigned int’ is not compatible with any association
 #define FooBar(x) _Generic((x), uint32_t: FooBar_U32,\
                            ^
prog.c:13:5: note: in expansion of macro ‘FooBar’
     FooBar(foo);         // Try to promote a 16-bit to 32-bit value for FooBar_U32
     ^~~~~~
prog.c:7:28: error: ‘_Generic’ selector of type ‘float’ is not compatible with any association
 #define FooBar(x) _Generic((x), uint32_t: FooBar_U32,\
                            ^
prog.c:16:5: note: in expansion of macro ‘FooBar’
     FooBar(nib);  // Try to promote a float to a double for FooBar_DBL
     ^~~~~~

Standard output is empty