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Add access of value via Kind enum. Fixes #38.

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This commit is contained in:
Steven Schveighoffer 2019-11-30 09:30:29 -05:00
parent 3d0305da16
commit c322e43fd4
1 changed files with 25 additions and 0 deletions
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25
source/taggedalgebraic/taggedalgebraic.d
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@ -713,6 +713,31 @@ inout(T) get(T, U)(inout(TaggedAlgebraic!U) ta)
assert(ta.get!float == 1.0);
}
/** Gets the value stored in an algebraic type based on its kind.
*/
ref get(alias kind, U)(ref inout(TaggedAlgebraic!U) ta) if (is(typeof(kind) == typeof(ta).Kind))
{
return ta.m_union.value!kind;
}
/// ditto
auto get(alias kind, U)(inout(TaggedAlgebraic!U) ta) if (is(typeof(kind) == typeof(ta).Kind))
{
return ta.m_union.value!kind;
}
@nogc @safe nothrow unittest {
struct Fields {
int a;
float b;
}
alias TA = TaggedAlgebraic!Fields;
auto ta = TA(1);
assert(ta.get!(TA.Kind.a) == 1);
ta.get!(TA.Kind.a) = 2;
assert(ta.get!(TA.Kind.a) == 2);
ta = TA(1.0);
assert(ta.get!(TA.Kind.b) == 1.0);
}
/** Calls a the given callback with the static type of the contained value.