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Implement the changes from P2757R3, which enhance the parse context to be able to do type checking on format arguments, and to use that to ensure that args used for width and precisions are integral types. libstdc++-v3/ChangeLog: PR libstdc++/115776 * include/bits/version.def (format): Update for C++26. * include/bits/version.h: Regenerate. * include/std/format (basic_format_parse_context): Remove default argument from constructor and split into two constructors. Make the constructor taking size_t private for C++26 and later. (basic_format_parse_context::check_dynamic_spec): New member function template. (basic_format_parse_context::check_dynamic_spec_integral): New member function. (basic_format_parse_context::check_dynamic_spec_string): Likewise. (__format::_Spec::_S_parse_width_or_precision): Use check_dynamic_spec_integral. (__format::__to_arg_t_enum): New helper function. (basic_format_arg): Declare __to_arg_t_enum as friend. (__format::_Scanner): Define and use a derived parse context type. (__format::_Checking_scanner): Make arg types available to parse context. * testsuite/std/format/functions/format.cc: Check for new values of __cpp_lib_format macro. * testsuite/std/format/parse_ctx.cc: Check all members of basic_format_parse_context. * testsuite/std/format/parse_ctx_neg.cc: New test. * testsuite/std/format/string.cc: Add more checks for dynamic width and precision args.
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