[diff.cpp20.containers] (original) (raw)

Affected subclauses: [associative.reqmts] and [unord.req]

Change: Heterogeneous extract and erase overloads for associative containers.

Rationale: Improve efficiency of erasing elements from associative containers.

Effect on original feature: Valid C++ 2020 code may fail to compile in this revision of C++.

[Example 1: struct B { auto operator<=>(const B&) const = default;};struct D : private B { void f(std::set<B, std::less<>>& s) { s.erase(*this); // ill-formed; previously well-formed } }; — _end example_]