Message ID | 20240915151846.26403-1-jwakely@redhat.com |
---|---|
State | New |
Headers | show |
Series | [committed] libstdc++: Add assertion for valid facet type arguments | expand |
diff --git a/libstdc++-v3/include/bits/locale_classes.h b/libstdc++-v3/include/bits/locale_classes.h index 50a748066f1..e168881b516 100644 --- a/libstdc++-v3/include/bits/locale_classes.h +++ b/libstdc++-v3/include/bits/locale_classes.h @@ -381,6 +381,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #endif }; +#if __cpp_lib_type_trait_variable_templates // C++ >= 17 + template<typename _Tp> + constexpr bool __is_facet = is_base_of_v<locale::facet, _Tp>; + template<typename _Tp> + constexpr bool __is_facet<volatile _Tp> = false; +#endif // 22.1.1.1.2 Class locale::facet /** diff --git a/libstdc++-v3/include/bits/locale_classes.tcc b/libstdc++-v3/include/bits/locale_classes.tcc index d5ef1911057..1b5f5f2417c 100644 --- a/libstdc++-v3/include/bits/locale_classes.tcc +++ b/libstdc++-v3/include/bits/locale_classes.tcc @@ -71,6 +71,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION locale:: combine(const locale& __other) const { +#if __cpp_lib_type_trait_variable_templates // C++ >= 17 + static_assert(__is_facet<_Facet>, "Template argument must be a facet"); +#endif + _Impl* __tmp = new _Impl(*_M_impl, 1); __try {