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Enum member std.variant.VariantN.allowed
Tells whether a type T
is statically allowed for
storage inside a VariantN
object by looking
T
up in AllowedTypes
.
struct VariantN
{
// ...
enum allowed(T) = is(T == VariantN) || (AllowedTypes .length == 0 || staticIndexOf!(T, AllowedTypes) >= 0);
// ...
}
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