1+++
2title = "`static bool _has_error_is_errno(Impl &&) noexcept`"
3description = "Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX `errno`. Constexpr, never throws."
4categories = ["observers"]
5weight = 240
6+++
7
8Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX `errno`. Constexpr where possible.
9
10*Requires*: Always available.
11
12*Complexity*: Constant time.
13
14*Guarantees*: Never throws an exception.
15