Begin vs Cbegin: Key Differences in C++ Container Iteration
Begin gives you a plain iterator that lets you read and modify elements; cbegin hands you a const_iterator that can only read.
Picture a chef tasting soup: Begin lets them sip and tweak seasoning, while cbegin is the health inspector who only sniffs. Devs often grab Begin out of habit, then panic when const-correctness flags appear.
Key Differences
Begin returns iterator
Which One Should You Choose?
Need to change elements? Use Begin. Only reading? Prefer cbegin to lock the container and catch accidental writes at compile time.
Examples and Daily Life
Looping to print names: cbegin keeps them safe. Looping to uppercase names: switch to Begin so the data can change.
Can I mix them in one loop?
Yes, but don’t: mixing mutating and const iterators confuses readers and the compiler.
Does cbegin add runtime cost?
No—both are inline, zero-overhead wrappers around the same internal pointer.