Method mutable_slice

API/fleece/slice.hh:305–305

        size_t size;

        constexpr mutable_slice() noexcept                      :buf(nullptr), size(0) {}
        explicit constexpr mutable_slice(pure_slice s) noexcept :buf((void*)s.buf), size(s.size) {}
        constexpr mutable_slice(void* b, size_t s) noexcept     :buf(b), size(s) {}
        constexpr mutable_slice(void* b NONNULL, void* e NONNULL) noexcept     :buf(b),