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Add TaggedUnion.hasType!T.

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This commit is contained in:
Sönke Ludwig 2019-02-23 16:16:20 +01:00
parent a52958ef01
commit 6589bac23a
1 changed files with 15 additions and 1 deletions
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16
source/taggedalgebraic/taggedunion.d
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@ -203,7 +203,20 @@ struct TaggedUnion(U) if (is(U == union) || is(U == struct) || is(U == enum))
} else {
mixin("static @property TaggedUnion "~name~"() { TaggedUnion tu; tu.set!(Kind."~name~"); return tu; }");
}
}
/** Checks whether the currently stored value has a given type.
*/
@property bool hasType(T)()
const {
static assert(staticIndexOf!(T, FieldTypes) >= 0, "Type "~T.stringof~ " not part of "~FieldTypes.stringof);
final switch (this.kind) {
static foreach (i, n; fieldNames) {
case __traits(getMember, Kind, n):
return is(FieldTypes[i] == T);
}
}
}
/** Accesses the contained value by reference.
@ -237,8 +250,9 @@ struct TaggedUnion(U) if (is(U == union) || is(U == struct) || is(U == enum))
See_Also: `set`, `opAssign`
*/
@property ref inout(T) value(T)() inout
if (staticIndexOf!(T, FieldTypes) >= 0)
{
static assert(staticIndexOf!(T, FieldTypes) >= 0, "Type "~T.stringof~ " not part of "~FieldTypes.stringof);
final switch (this.kind) {
static foreach (i, n; fieldNames) {
case __traits(getMember, Kind, n):