我是否需要在循环结束时调用 unlock()对于本地 unique_lock？

如何解决我是否需要在循环结束时调用 unlock()对于本地 unique_lock？

这是：

std::mutex mutex;
for () {
    std::unique_lock<mutex> lock(mutex);
    // do something
    lock.unlock();
}

在for循环的每次迭代中释放和获取锁等价于这个吗？

std::mutex mutex;
for () {
    std::unique_lock<mutex> lock(mutex);
    // do something
}

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