Allow typeof(null) to provide constructors and opAssign for TaggedUnion.
Fixes #36.
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@ -75,15 +75,22 @@ align(commonAlignment!(UnionKindTypes!(UnionFieldEnum!U))) struct TaggedUnion
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}
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static foreach (ti; UniqueTypes!FieldTypes)
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static if (!isUnitType!(FieldTypes[ti])) {
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static if(!is(FieldTypes[ti] == void))
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{
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this(FieldTypes[ti] value)
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{
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set!(cast(Kind)ti)(move(value));
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static if (isUnitType!(FieldTypes[ti]))
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set!(cast(Kind)ti)();
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else
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set!(cast(Kind)ti)(move(value));
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}
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void opAssign(FieldTypes[ti] value)
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{
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set!(cast(Kind)ti)(move(value));
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static if (isUnitType!(FieldTypes[ti]))
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set!(cast(Kind)ti)();
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else
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set!(cast(Kind)ti)(move(value));
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}
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}
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@ -496,6 +503,14 @@ unittest { // toString
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assert(val.to!string == "(noCopy: foo)");
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}
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unittest { // null members should be assignable
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union U { int i; typeof(null) Null; }
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TaggedUnion!U val;
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val = null;
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assert(val.kind == val.Kind.Null);
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val = TaggedUnion!U(null);
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assert(val.kind == val.Kind.Null);
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}
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/** Dispatches the value contained on a `TaggedUnion` to a set of visitors.
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