How do I use owning_view and ref_view correctly?

In C++, the owning_view and ref_view are part of the range-v3 library which provides improved views for handling collections. The owning_view is utilized to provide ownership semantics for a range of items, while ref_view provides a reference view, allowing you to access elements without taking ownership. This is particularly useful when dealing with temporary objects or polymorphic data types.

Using owning_view and ref_view

Here are some examples demonstrating how to use owning_view and ref_view:

<?php // Assuming you have installed the range-v3 library include 'vendor/autoload.php'; use ranges\owning_view; use ranges\ref_view; $data = [1, 2, 3, 4, 5]; // Creating an owning_view from an array $owning_view = owning_view::make($data); // Modifying the underlying array through the owning_view foreach ($owning_view as &$value) { $value *= 2; } print_r($owning_view->to_array()); // Creating a ref_view from an array (without ownership) $ref_view = ref_view::make($data); // Accessing elements through the ref_view foreach ($ref_view as $value) { echo $value . " "; // Will print modified values from owning_view } ?>

C++ owning_view ref_view range-v3 library ownership semantics reference view collections

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