[libcxx-commits] [PATCH] D91778: [libc++] [P0966] [C++20] Fix bug PR45368 by correctly implementing P0966: string::reserve should not shrink.

[Richard Smith - zygoloid via Phabricator via libcxx-commits]

rsmith added inline comments.


================
Comment at: libcxx/include/string:3273-3276
+#if _LIBCPP_STD_VER > 17
+    // Reserve never shrinks as of C++20.
+    if (__requested_capacity <= capacity()) return;
+#endif
----------------
This `#if` doesn't seem to work: because `reserve(size_type)` is not inline, we always use the version from the libc++ library, which means we get the C++17 behavior if the library was built in C++17 mode, and we get the C++20 behavior if the library was built in C++20 mode, regardless of the standard mode used by the compilation using libc++.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91778/new/

https://reviews.llvm.org/D91778