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Add a comment explaining how DenseMap::insert works, because it is not

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intuitive.
It does NOT update the value if the key is already in the map,
it also returns false if the key is already in the map, regardless
if the value matched.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin 2009-10-07 09:23:56 +00:00
parent 4de86fe0d7
commit 127445818e
1 changed files with 3 additions and 0 deletions
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3
include/llvm/ADT/DenseMap.h
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@ -145,6 +145,9 @@ public:
return ValueT();
}
// Inserts key,value pair into the map if the key isn't already in the map.
// If the key is already in the map, it returns false and doesn't update the
// value.
std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &KV) {
BucketT *TheBucket;
if (LookupBucketFor(KV.first, TheBucket))