CTFE cannot be used when a struct has "uninitialized" static array union members?
simendsjo
simendsjo at gmail.com
Sun Apr 14 05:37:35 PDT 2013
This is probably not a minimal test-case, and I haven't tested
with more types, but it shows the problem.
// This works
struct S {
this(int i) {
a = i;
}
union {
int a = void;
int b = void;
}
}
unittest
{
auto s = S(1);
assert(&s.a == &s.b);
enum s2 = S(1);
static assert(S(1).a == 1);
}
// But this doesn't
struct S2 {
this(int i) { // error at this line
a[] = i;
}
union {
int[1] a = void;
int[1] b = void;
}
}
unittest
{
auto s = S2(1);
assert(s.a.ptr == s.b.ptr);
// bug.d(19): Error: uninitialized variable 'b' cannot be
returned from CTFE
enum s2 = S2(1);
}
void main() {
}
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