What\'s the Most Efficient Way to Iterate Over Multiple Containers Simultaneously in C ?

Iterating over Multiple Containers Simultaneously

C 11 offers various methods for container iteration, including range-based loops and std::for_each. However, which approach is most effective when iterating over multiple containers of equivalent size, such as:

for(unsigned i = 0; i < containerA.size(); ++i) {
  containerA[i] = containerB[i];
}

The Recommended Solution: Iterating over Indices

The recommended approach is iterating over the indices using a range-based for loop:

for(unsigned i : indices(containerA)) {
    containerA[i] = containerB[i];
}

Where indices is a simple wrapper function that generates a lazy range for the indices. This method matches the efficiency of the manual for loop.

Zipping Containers (C 17 )

For frequent occurrences of this pattern, consider using the zip function to create a range of tuples combining paired elements:

for (auto& [a, b] : zip(containerA, containerB)) {
    a = b;
}

This approach simplifies code and enhances readability.

The above is the detailed content of What\'s the Most Efficient Way to Iterate Over Multiple Containers Simultaneously in C ?. For more information, please follow other related articles on the PHP Chinese website!