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This changes the __numeric_traits primary template to assume its argument is an integer type. For the three floating point types that are supported by __numeric_traits_floating an explicit specialization of __numeric_traits chooses the right base class. This improves the failure mode for using __numeric_traits with an unsupported type. Previously it would use __numeric_traits_floating as the base class, and give somewhat obscure errors for trying to access the static data members. Now it will use __numeric_traits_integer which has a static_assert to check for supported types. As a side effect of this change there is no need to instantiate __conditional_type to decide which base class to use. libstdc++-v3/ChangeLog: * include/ext/numeric_traits.h (__numeric_traits): Change primary template to always derive from __numeric_traits_integer. (__numeric_traits<float>, __numeric_traits<double>) (__numeric_traits<long double>): Add explicit specializations. |
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