Initializing std::unordered_set using uniform initialization in C++

24 Oct 2023

When initializing an std::unordered_set, you can use uniform initialization to provide the initial elements directly. This approach is concise and less error-prone compared to other initialization methods.

Here’s an example of how you can initialize an std::unordered_set using uniform initialization:

#include <iostream>
#include <unordered_set>

int main() {
    // Initialize an unordered_set of integers
    std::unordered_set<int> mySet = {1, 2, 3, 4, 5};

    // Iterate over the set and print the elements
    for (const auto& element : mySet) {
        std::cout << element << " ";
    }

    return 0;
}

In the example above, we create an std::unordered_set called mySet and initialize it with the elements 1, 2, 3, 4, and 5 using uniform initialization. We then iterate over the set using a range-based for loop and print each element to the standard output.

When you run this code, the output will be:

1 2 3 4 5

Uniform initialization allows you to provide initial elements directly within the curly braces {} when creating an std::unordered_set object. This approach can be used with other types as well, such as strings or custom objects.

By using uniform initialization, you can easily initialize an std::unordered_set with multiple elements in a concise and readable manner.

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