Method Decrement

src/brpc/memcache.cpp:631–634

}

bool MemcacheRequest::Decrement(const butil::StringPiece& key, uint64_t delta,
                                uint64_t initial_value, uint32_t exptime) {
    return Counter(policy::MC_BINARY_DECREMENT, key, delta, initial_value, exptime);
}

// MUST NOT have extras.
// MUST NOT have key.