1+++
2title = "`static auto &&_error(Impl &&) noexcept`"
3description = "Returns a reference to the error in the implementation passed in. Constexpr, never throws."
4categories = ["observers"]
5weight = 260
6+++
7
8Returns a reference to the error in the implementation passed in. No checking is done to ensure there is an error. Constexpr where possible.
9
10*Requires*: Always available.
11
12*Complexity*: Constant time.
13
14*Guarantees*: Never throws an exception.
15