Using lock_guard in loop

Question

I have an array where each of its entries is a linked list. To avoid synchronization problems when accessing the linked lists I added a mutex to each entry.

My question is can I convert the following calls to lock and unlock in each iteration of the loop to one lock_guard as shown below? Will the mutex of each entry be unlocked after each iteration? Thanks.

for(int i = 0; i < TABLE_SIZE; ++i)
{
    table[i].entryMtx.lock ();

    //... access the linked list of the entry...

    table[i].entryMtx.unlock ();
}

// --->

for(int i = 0; i < TABLE_SIZE; ++i)
{
    std::lock_guard < std::mutex > lk (table[i].entryMtx);

    // ... access the linked list of the entry
}

Answer 1

Yes, this is how destructors are used in C++ (and other languages).

However, it's not stdx, it's std. Probably a typo.