How to Manage Mutexes in a std::vector: Unique Pointers, Containers, and More?

Using std::vector and Alternative Solutions

In multithreaded environments, protecting concurrent data access is crucial. One approach is to employ std::vector, but this raises an issue due to the отсутствие of copy or move constructors in std::mutex.

To address this, consider the following solutions:

1. Leverage std::unique_ptr:

Define a unique pointer to std::mutex to manage individual mutexes. However, this approach involves dynamic memory allocation and deallocation for each mutex, leading to performance concerns.

2. Employ std::deque or std::list:

These containers do not impose the same requirements on values as std::vector. Construct mutexes in place or use emplace() or resize() to achieve the desired functionality. Functions like insert() and push_back() are incompatible with this approach.

3. Create an indirection layer with unique_ptr:

Store unique_ptr in a vector. This technique introduces an additional layer of indirection and may be less desirable due to dynamic allocation overhead.

4. Use std::unique_ptr:

Allocate an array of mutexes with a fixed size. If more mutexes are required, resize the array dynamically. This provides a flexible solution with less allocation overhead than individual unique pointers.

Based on your requirements, the most appropriate approach is std::unique_ptr for its adjustable number of mutexes without mutex locks, manageable overhead, and flexibility in resizing.

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