.. title:: clang-tidy - performance-noexcept-swap

performance-noexcept-swap
=========================

The check flags user-defined swap and iter_swap functions not marked with
``noexcept`` or marked with ``noexcept(expr)`` where ``expr`` evaluates to
``false`` (but is not a ``false`` literal itself).

When a swap or iter_swap function is marked as ``noexcept``, it assures the
compiler that no exceptions will be thrown during the swapping of two objects,
which allows the compiler to perform certain optimizations such as omitting
exception handling code.
