On Thu, 20 Jan 2022, 03:55 Itaru Kitayama via Gcc-help, < gcc-help@xxxxxxxxxxx> wrote: > I am wondering how GCC C++ runtime library addresses this Notes in: > > https://en.cppreference.com/w/cpp/memory/polymorphic_allocator > > if I use consistently the same polymorphic allocator, be it the > default or custom one, for > the std::pmr::vectors, I don't need to worry about the Notes? > Correct. But because a polymorphic_allocator doesn't propagate, it's up to you to ensure you use it consistently. If you construct two pmr::vector objects with unequal allocators, you must not swap them. If you compile with -D_GLIBCXX_ASSERTIONS the library will abort the program if you try to swap containers with unequal allocators: https://gcc.gnu.org/git?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/bits/stl_vector.h;h=8e2fcc6f49b2061265cf71ed1b214e7bb5b87fa0;hb=HEAD#l1568 >
