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73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
#include <stdio.h>
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enum fred
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{
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a,
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b,
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c,
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d,
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e = 54,
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f = 73,
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g,
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h
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};
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/* All following uses of enum efoo should compile
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without warning. While forward enums aren't ISO C,
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it's accepted by GCC also in strict mode, and only warned
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about with -pedantic. This happens in the real world. */
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/* Strict ISO C doesn't allow this kind of forward declaration of
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enums, but GCC accepts it (and gives only pedantic warning), and
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it occurs in the wild. */
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enum efoo;
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struct Sforward_use {
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int (*fmember) (enum efoo x);
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};
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extern enum efoo it_real_fn(void);
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enum efoo {
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ONE,
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TWO,
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};
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struct S2 {
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enum efoo (*f2) (void);
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};
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void should_compile(struct S2 *s)
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{
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s->f2 = it_real_fn;
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}
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enum efoo it_real_fn(void)
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{
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return TWO;
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}
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static unsigned int deref_uintptr(unsigned int *p)
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{
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return *p;
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}
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enum Epositive {
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epos_one, epos_two
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};
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int main()
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{
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enum fred frod;
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enum Epositive epos = epos_two;
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printf("%d %d %d %d %d %d %d %d\n", a, b, c, d, e, f, g, h);
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/* printf("%d\n", frod); */
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frod = 12;
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printf("%d\n", frod);
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frod = e;
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printf("%d\n", frod);
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/* Following should compile without warning. */
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printf ("enum to int: %u\n", deref_uintptr(&epos));
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return 0;
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}
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/* vim: set expandtab ts=4 sw=3 sts=3 tw=80 :*/
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