diff options
Diffstat (limited to 'gdb/common/traits.h')
| -rw-r--r-- | gdb/common/traits.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/gdb/common/traits.h b/gdb/common/traits.h index 4b7bac3..c8f29cc 100644 --- a/gdb/common/traits.h +++ b/gdb/common/traits.h @@ -18,6 +18,8 @@ #ifndef COMMON_TRAITS_H #define COMMON_TRAITS_H +#include <type_traits> + namespace gdb { /* Pre C++14-safe (CWG 1558) version of C++17's std::void_t. See @@ -29,6 +31,30 @@ struct make_void { typedef void type; }; template<typename... Ts> using void_t = typename make_void<Ts...>::type; +/* A few trait helpers, mainly stolen from libstdc++. Uppercase + because "and" is a keyword. */ + +template<typename...> +struct And; + +template<> +struct And<> : public std::true_type +{}; + +template<typename B1> +struct And<B1> : public B1 +{}; + +template<typename B1, typename B2> +struct And<B1, B2> + : public std::conditional<B1::value, B2, B1>::type +{}; + +template<typename B1, typename B2, typename B3, typename... Bn> +struct And<B1, B2, B3, Bn...> + : public std::conditional<B1::value, And<B2, B3, Bn...>, B1>::type +{}; + } #endif /* COMMON_TRAITS_H */ |