Why isn’t vector a STL container?

For space-optimization reasons, the C++ standard (as far back as C++98) explicitly calls out vector<bool> as a special standard container where each bool uses only one bit of space rather than one byte as a normal bool would (implementing a kind of “dynamic bitset”). In exchange for this optimization it doesn’t offer all the capabilities … Read more

What is the best practice of docker + ufw under Ubuntu

Problem This problem has been around for a long time. Disable iptables in Docker will take other problems. Rollback changes first If you have modified your server according to the current solution that we find on the internet, please rollback these changes first, including: Enable Docker’s iptables feature. Remove all changes like –iptables=false , including … Read more

What’s the best way to iterate over two or more containers simultaneously

Rather late to the party. But: I would iterate over indices. But not with the classical for loop but instead with a range-based for loop over the indices: for(unsigned i : indices(containerA)) { containerA[i] = containerB[i]; } indices is a simple wrapper function which returns a (lazily evaluated) range for the indices. Since the implementation … Read more

How to know the reason why a docker container exits?

Others have mentioned docker logs $container_id to view the output of the application. This would always be my first thing to check. Next, you can run a docker inspect $container_id to view details on the state, e.g.: “State”: { “Status”: “exited”, “Running”: false, “Paused”: false, “Restarting”: false, “OOMKilled”: false, “Dead”: false, “Pid”: 0, “ExitCode”: 2, … Read more

What are the complexity guarantees of the standard containers?

I found the nice resource Standard C++ Containers. Probably this is what you all looking for. VECTOR Constructors vector<T> v; Make an empty vector. O(1) vector<T> v(n); Make a vector with N elements. O(n) vector<T> v(n, value); Make a vector with N elements, initialized to value. O(n) vector<T> v(begin, end); Make a vector and copy … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)