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Why can't I use std::function as a std::set or std::unordered_set value type? Languages

Why can't I use std::function as a std::set or std::unordered_set value type?

Why can't I have a std::set or std::unordered_set of std::functions?Is there any way to get it to work anyway?
11月24日 发表评论
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unordered_map pointer to element's value valid after resize? Languages

unordered_map pointer to element's value valid after resize?

If I have an unordered_map<key, someNiceObject>(note someNiceObject is not a pointer)I have an API which inserts a new element, then returns a pointer to someNiceObject now in the map.
11月05日 发表评论
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Range-based for loop on unordered_map and references Languages

Range-based for loop on unordered_map and references

When running a range-based for loop on an std::unordered_map it appears that the type of the loop variable does not use reference types:
10月21日 发表评论
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std::unordered_map::extract references/pointers invalidation Languages

std::unordered_map::extract references/pointers invalidation

For the new C++17 std::unordered_map::extract function the documentation says:Extracting a node invalidates only the iterators to the extracted element, and preserves the relative order of the elements that are not erased. Pointers and references to the extracted element remain valid, but cannot be used while element is owned by a...
10月11日 发表评论
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Does std::unordered_map equality depend on insertion order Languages

Does std::unordered_map equality depend on insertion order

If you create two std::unordered_map containers using the same set of (non equal) key-value pairs, but inserted in a different order (so the containers hold equal elements, but potentially in different orders), are the containers guaranteed to be equal, according to the equality operator (operator==). I'm assuming that the hash-code...
08月06日 发表评论
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