Can You Remove Elements from a C Vector While Using a Range-Based For Loop?

Iterating and Modifying Vectors with C 11 Range Loop

When looping through a vector using C 11's range-based for, a common question arises: can you remove an item while within the loop?

Limitations of Range-based For Loops

The answer is no, as range-based for loops are designed for accessing each element of a container a single time. If you need to modify the container, remove elements, or perform non-linear iterations, you should use a traditional for loop instead.

Modifying Vectors with Traditional Loops

To remove an item from a vector while iterating, you can use a traditional for loop:

for (auto it = inv.begin(); it != inv.end(); ++it) {
    // Do some stuff
    if (blah) {
        it = inv.erase(it);
        --it;  // Decrement iterator to avoid skipping an element
    }
}

Advantages of Traditional Loops

Traditional loops offer more flexibility than range-based for loops:

• You can access elements multiple times.
• You can modify the container by adding or removing elements.
• You can iterate through the container in a non-linear fashion, such as skipping or revisiting elements.

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