Converting a View Back to a Standard Container
How can I convert a view back to a standard container like std::vector
?
Converting a view back to a standard container like std::vector
is straightforward. You can use the range-based constructor of std::vector
to achieve this.
Here's an example:
#include <iostream>
#include <ranges>
#include <vector>
int main() {
std::vector<int> Numbers{1, 2, 3, 4, 5};
auto View = std::views::take(Numbers, 3);
std::vector<int> NewContainer(
View.begin(), View.end());
for (int Num : NewContainer) {
std::cout << Num << ", ";
}
}
1, 2, 3,
Explanation
- Create View: We create a view of the first three elements using
std::views::take()
. - Convert to
std::vector
: We use the range-based constructor ofstd::vector
to initializeNewContainer
with the elements of the view. - Output: We then iterate over the new container to display its elements.
Advantages
- Efficiency: This method efficiently copies elements from the view to the new container.
- Simplicity: It leverages existing C++ mechanisms for range-based initialization.
This approach can be adapted to other standard containers, such as std::list
or std::deque
, using their range-based constructors in a similar manner.
For example, converting to a std::list
:
#include <iostream>
#include <list>
#include <ranges>
#include <vector>
int main() {
std::vector<int> Numbers{1, 2, 3, 4, 5};
auto View = std::views::take(Numbers, 3);
std::list NewContainer(View.begin(), View.end());
for (int Num : NewContainer) {
std::cout << Num << ", ";
}
}
1, 2, 3,
Using this method, you can easily convert views back to any standard container type, preserving the benefits of views while enabling further manipulations or storage as needed.
Standard Library Views
Learn how to create and use views in C++ using examples from std::views