debian-packages/taggedalgebraic
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Add UFCS functions get and hasType.

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Sönke Ludwig 2015-08-13 15:59:50 +02:00
parent e53ae02ec6
commit d901bfa810
1 changed files with 21 additions and 1 deletions
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22
source/taggedalgebraic.d
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@ -180,7 +180,27 @@ struct TaggedAlgebraic(U) if (is(U == union) || is(U == struct))
assert(false); // never reached
}
private @trusted @property ref inout(typeof(__traits(getMember, U, f))) trustedGet(string f)() inout { return *cast(inout(typeof(__traits(getMember, U, f)))*)m_data.ptr; }
private @trusted @property ref inout(typeof(__traits(getMember, U, f))) trustedGet(string f)() inout { return trustedGet!(inout(typeof(__traits(getMember, U, f)))); }
private @trusted @property ref inout(T) trustedGet(T)() inout { return *cast(inout(T)*)m_data.ptr; }
}
bool hasType(T, U)(in ref TaggedAlgebraic!U ta)
{
switch (ta.typeID) {
default: return false;
foreach (i, FT; ta.FieldTypes)
static if (is(FT == T)) {
case __traits(getMember, ta.Type, ta.fieldNames[i]):
return true;
}
}
assert(false); // never reached
}
ref inout(T) get(T, U)(ref inout(TaggedAlgebraic!U) ta)
{
assert(hasType!(T, U)(ta));
return ta.trustedGet!T;
}