1.. title:: clang-tidy - performance-noexcept-swap 2 3performance-noexcept-swap 4========================= 5 6The check flags user-defined swap and iter_swap functions not marked with ``noexcept`` or 7marked with ``noexcept(expr)`` where ``expr`` evaluates to ``false`` 8(but is not a ``false`` literal itself). 9 10When a swap or iter_swap function is marked as ``noexcept``, it assures the compiler that 11no exceptions will be thrown during the swapping of two objects, which allows 12the compiler to perform certain optimizations such as omitting exception 13handling code. 14