martinzink commented on code in PR #1612:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1612#discussion_r1270534444
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libminifi/include/utils/FlatMap.h:
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@@ -138,7 +134,9 @@ class FlatMap{
return data_.size();
}
- V& operator[](const K& key) {
+ template<typename T>
+ requires std::constructible_from<K, T> && std::equality_comparable_with<K, T>
Review Comment:
operator[] inserts a default constructred value at the specified key if its
not already there. for that we need to create the actual keytype that we can
insert alongside with this new value, thats why we need the constraint
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