How to Split a Vector in C++

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How to Split a Vector in C++ ?

Answer

In C++, you can split a vector into smaller parts using iterators, algorithms, or by manually copying elements.

✐ Examples

1 Split Vector by Iterator

In this example,

We create a vector named data containing elements.
We define an iterator pointing to the splitting position.
We use the std::vector's constructor with iterator range to split the vector.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<int> data = {1, 2, 3, 4, 5, 6};
    auto split_it = data.begin() + 3;
    std::vector<int> left(data.begin(), split_it);
    std::vector<int> right(split_it, data.end());
    std::cout << "Left part: ";
    for (auto& num : left) std::cout << num << ' ';
    std::cout << '\n';
    std::cout << "Right part: ";
    for (auto& num : right) std::cout << num << ' ';
    std::cout << '\n';
    return 0;
}

Output

Left part: 1 2 3 
Right part: 4 5 6

2 Split Vector by Predicate

In this example,

We create a vector named data containing elements.
We define a lambda function or functor representing the splitting condition.
We use the std::partition algorithm to partition the vector based on the predicate.

C++ Program

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> data = {1, 2, 3, 4, 5, 6};
    auto split_predicate = [](int x) { return x > 3; };
    auto split_point = std::partition(data.begin(), data.end(), split_predicate);
    std::vector<int> left(data.begin(), split_point);
    std::vector<int> right(split_point, data.end());
    std::cout << "Left part: ";
    for (auto& num : left) std::cout << num << ' ';
    std::cout << '\n';
    std::cout << "Right part: ";
    for (auto& num : right) std::cout << num << ' ';
    std::cout << '\n';
    return 0;
}

Output

Left part: 1 2 3 
Right part: 4 5 6

Summary

In this tutorial, we learned How to Split a Vector in C++ language with well detailed examples.

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How to Split a Vector in C++

How to Split a Vector in C++ ?

Answer

✐ Examples

1 Split Vector by Iterator

C++ Program

Output

2 Split Vector by Predicate

C++ Program

Output

Summary

More C++ Vectors Tutorials