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How to Implement `make_unique` in C 11 for Enhanced Ownership Management?

Barbara Streisand
Barbara StreisandOriginal
2024-10-30 09:32:27374browse

How to Implement `make_unique` in C  11 for Enhanced Ownership Management?

Custom Implementation of make_unique in C 11

make_unique is a utility function introduced in C 14 to create a unique_ptr object with a dynamically allocated instance. This is useful when a raw pointer is not desired and ownership management is necessary. However, if your compiler does not support make_unique, it can be easily implemented using a custom template function.

To write make_unique, the following template declaration is used:

<code class="cpp">template< class T, class... Args >
unique_ptr<T> make_unique( Args&&... args );</code>

This template takes a type T and a variable number of arguments Args. The following implementation creates a unique_ptr object with a new T instance constructed using the provided arguments:

<code class="cpp">template<typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args)
{
    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}</code>

The std::forward syntax is used to ensure perfect forwarding of the arguments to the constructor. By calling std::forward, the reference collapsing rules are not applied, and lvalue or rvalue references are preserved.

This custom implementation of make_unique mimics the behavior of the standard version, allowing you to create unique_ptr objects in C 11 environments where make_unique is not supported.

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