1+++ 2title = "`basic_result(const basic_result &)`" 3description = "Copy constructor. Constexpr, triviality and noexcept propagating." 4categories = ["constructors", "implicit-constructors", "copy-constructors"] 5weight = 120 6+++ 7 8Copy constructor. 9 10*Requires*: that `value_type` and `error_type` both implement a copy constructor. 11 12*Complexity*: Same as for `value_type`'s and `error_type`'s copy constructors. Constexpr, triviality and noexcept of underlying operations is propagated. 13 14*Guarantees*: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a `struct`. 15