On Fri, 5 Jul 2024 at 15:48, Phil Phil via Boost-users < boost-users@lists.boost.org> wrote:
> > I try to port a c++ project to a new environment with clang++-17, libcxx > 17 and std=c++17 for x64 Linux. Also, I switched form boost 1.65 to 1.84. > Now I start getting errors in boost itself: > > /workspace/usr/include/boost/statechart/fifo_worker.hpp:55:45: error: > template argument for template type parameter must be a type > 55 | template< class Allocator = std::allocator< none > > > > I'm not sure if this answers your issue, but from ยง12.3.4 (p197) of C++ Templates <https://www.amazon.co.uk/Templates-Complete-Guide-David-Vandevoorde/dp/0321714121/ref=sr_1_1?crid=1SNPB9AQYKH7U&dib=eyJ2IjoiMSJ9.b0YMM1EtQwSigfaRYI6qiFrhXcDLFPGBOmBMQHDFPla2BvLWwCfWPBW0N6KeBwdupdfKDTYnGanIFme0azAt_QwDrPREL7tv3tPhs9z5ObvZ6kEpj9NRTPz1JOZYsrexKH0Fe_oOcoFIFNQtsiaJuT831tbIkY5n7SMEj-mNhhH-DlkR3EogCv4DjhARxByEAXE0OowZbvC2WiKPbvnnZ7PtWKzuRX7c3CampkYGHlo.SMnSkcLgYS4TkN1uSxVXGy2ACu9xaT-LcNLkg6fK5yo&dib_tag=se&keywords=templates+c%2B%2B&qid=1720192741&sprefix=templates+c%2B%2B%2Caps%2C89&sr=8-1> , Prior to C++17, default template template arguments of a template template argument were ignored (but if the template template parameter has default arguments, they are considered during the instantiation of the template). HTHs, Rob
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