1+++ 2title = "`static auto &&_value(Impl &&) noexcept`" 3description = "Returns a reference to the value in the implementation passed in. Constexpr, never throws." 4categories = ["observers"] 5weight = 250 6+++ 7 8Returns a reference to the value in the implementation passed in. No checking is done to ensure there is a value. Constexpr where possible. 9 10*Requires*: Always available. 11 12*Complexity*: Constant time. 13 14*Guarantees*: Never throws an exception. 15