C++ named requirements: EmplaceConstructible (since C++11)
Min standard notice:
Specifies that an object of the type can be constructed from a given set of arguments in uninitialized storage by a given allocator.
# Notes
Although it is required that customized construct is used when constructing elements of std::basic_string until C++23, all implementations only used the default mechanism. The requirement is corrected by P1072R10 to match existing practice.