b334182653
This attempts to make is_nothrow_constructible more robust (and efficient to compile) by not depending on is_constructible. Instead the __is_constructible intrinsic is used directly. The helper class __is_nt_constructible_impl which checks whether the construction is non-throwing now takes a bool template parameter that is substituted by the result of the instrinsic. This fixes the reported bug by not using the already-instantiated (and incorrect) value of std::is_constructible. I don't think it really fixes the problem in general, because std::is_nothrow_constructible itself could already have been instantiated in a context where it gives the wrong result. A proper fix needs to be done in the compiler. PR libstdc++/94033 * include/std/type_traits (__is_nt_default_constructible_atom): Remove. (__is_nt_default_constructible_impl): Remove. (__is_nothrow_default_constructible_impl): Remove. (__is_nt_constructible_impl): Add bool template parameter. Adjust partial specializations. (__is_nothrow_constructible_impl): Replace class template with alias template. (is_nothrow_default_constructible): Derive from alias template __is_nothrow_constructible_impl instead of __is_nothrow_default_constructible_impl. * testsuite/20_util/is_nothrow_constructible/94003.cc: New test. |
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| src | ||
| testsuite | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| ChangeLog | ||
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| config.h.in | ||
| configure | ||
| configure.ac | ||
| configure.host | ||
| crossconfig.m4 | ||
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| linkage.m4 | ||
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| README | ||
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.