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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Use of `std::basic_string\u003cuint32_t\u003e` will likely break with libc++ \u003e= 19.0.0","articleBody":"https://github.com/cpp-netlib/cpp-netlib/blob/552ce94bd91c055f11ba524adf0ca0712063d711/libs/network/src/server_request_parsers_impl.cpp#L21C1-L21C8\n\nIn libc++ 19.0.0 release notes (https://releases.llvm.org/19.1.0/projects/libcxx/docs/ReleaseNotes.html):\n\n\u003e The base template for `std::char_traits` has been removed in LLVM 19. If you are using `std::char_traits` with types other than `char`, `wchar_t`, `char8_t`, `char16_t`, `char32_t` or a custom character type for which you specialized `std::char_traits`, your code will stop working. The Standard does not mandate that a base template is provided, and such a base template is bound to be incorrect for some types, which could currently cause unexpected behavior while going undetected.\n\nIn NixOS, this is creating build failures for us when building `cpp-netlib-0.13.0-final` with clang:\n\n```\nIn file included from /tmp/nix-build-cpp-netlib-0.13.0-final.drv-0/source/libs/network/src/server_request_parsers_impl.cpp:10:\nIn file included from /tmp/nix-build-cpp-netlib-0.13.0-final.drv-0/source/boost/network/protocol/http/server/impl/parsers.ipp:5:\nIn file included from include/boost/spirit/include/qi.hpp:16:\nIn file included from include/boost/spirit/home/qi.hpp:14:\n...\n...\nIn file included from /nix/store/kx521w0j19ssvmcw8gfziiszjgm2bf8x-libcxx-19.1.7-dev/include/c++/v1/__format/parser_std_format_spec.h:39:\n/nix/store/kx521w0j19ssvmcw8gfziiszjgm2bf8x-libcxx-19.1.7-dev/include/c++/v1/string:2538:5: error: implicit instantiation of undefined template 'std::char_traits\u003cunsigned int\u003e'\n```\n\nbut I note that in your `main` it has been relocated to the above file with minimal changes so you're likely to have the same issues.","author":{"url":"https://github.com/risicle","@type":"Person","name":"risicle"},"datePublished":"2025-05-04T11:57:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/908/cpp-netlib/issues/908"}