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support for operations on sets that return new values

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This commit is contained in:
Vern Paxson 2021-03-18 10:38:38 -07:00
parent b242430bd1
commit 6898c36c51
1 changed files with 27 additions and 0 deletions
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27
src/Val.h
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@ -771,6 +771,33 @@ public:
*/
TableValPtr Intersection(const TableVal& v) const;
/**
* Returns a new table that is the union of this table and the
* given table. Union is done only on index, so this generally
* makes most sense to use for sets, not tables.
* @param v The union'ing table.
* @return The union of this table and the given one.
*/
TableValPtr Union(TableVal* v) const
{
auto v_clone = cast_intrusive<TableVal>(v->Clone());
AddTo(v_clone.get(), false, false);
return v_clone;
}
/**
* Returns a copy of this table with the given table removed.
* @param v The table to remove.
* @return The subset of this table that doesn't include v.
*/
TableValPtr TakeOut(TableVal* v)
{
auto clone = cast_intrusive<TableVal>(Clone());
cast_intrusive<TableVal>(v->Clone());
v->RemoveFrom(clone.get());
return clone;
}
// Returns true if this set contains the same members as the
// given set. Note that comparisons are done using hash keys,
// so errors can arise for compound sets such as sets-of-sets.