bycopy capture with an initializer
Here's an example of how to use "bycopy capture with an initializer":
```cpp
#include <iostream>
variable used in lambda
#include <vector>
int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    // Lambda that captures by copy
    auto byCopy = [numbers = numbers_copy(numbers)]() mutable {
        numbers.push_back(10);
    };
    byCopy();
    // Output: 1 2 3 4 5 10
    for (int num : numbers)
        std::cout << num << " ";
    std::cout << std::endl;
    return 0;
}
```
In the example above, the `numbers_copy` function is used to create a copy of the `numbers` vector. This copy is then captured by the lambda expression `byCopy`. Any modifications made to the captured variable within the lambda will not affect the original `numbers` vector.

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