Using Custom Deleters with std::unique_ptr Member Variables
When working with third-party classes that require a specific deletion mechanism, you may encounter scenarios where you need to use a custom deleter with std::unique_ptr member variables. This article provides a solution for achieving this.
Problem
Imagine you have a class Foo with a member variable of type std::unique_ptr. In this scenario, the third-party class Bar has a dedicated create() and destroy() function for object creation and destruction.
Standalone Function Example
In a standalone function, you can use a custom deleter with std::unique_ptr as follows:
void foo() { std::unique_ptr<bar void> bar(create(), [](Bar* b){ destroy(b); }); ... }</bar>
Using Custom Deleters with Member Variables
To achieve the same functionality when working with member variables, here's the solution:
class Foo { std::unique_ptr<bar void> ptr_; // ... public: Foo() : ptr_(create(), destroy) { /* ... */ } // ... };</bar>
In this code:
- The ptr_ member variable is declared as a unique_ptr of type Bar.
- The custom deleter is specified as the second template parameter, which is a function pointer with the signature void(*)(Bar*).
- The class constructor initializes ptr_ using the create() and destroy() functions as the deleter.
This approach allows you to utilize custom deleters for std::unique_ptr member variables conveniently, ensuring proper resource management even for third-party classes.
The above is the detailed content of How to Use Custom Deleters with `std::unique_ptr` Member Variables? ```. For more information, please follow other related articles on the PHP Chinese website!

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