memcached_return_t rc = memcached_add_by_key(memc, S("key"), rkey.c_str(), rkey.length(), blob.c_str(), blob.length(), 0, 0);
if (rc == MEMCACHED_MEMORY_ALLOCATION_FAILURE) {
memcached_return_t rc = memcached_add_by_key(memc, S("key"), rkey.c_str(), rkey.length(), blob.c_str(), blob.length(), 0, 0);
if (rc == MEMCACHED_MEMORY_ALLOCATION_FAILURE) {