Method fetch_sub

tests/framework/src/doctest.cpp:370–372

        }

        T fetch_sub(T arg, std::memory_order order = std::memory_order_seq_cst) DOCTEST_NOEXCEPT {
            return myAtomic().fetch_sub(arg, order);
        }

        operator T() const DOCTEST_NOEXCEPT { return load(); }