Creational Design Patterns in Modern C++ - Using the std::call_once Function

The video tutorial explains the call_once function introduced in C++11, which ensures a callable is executed exactly once, even when called from multiple threads. It covers the function's parameters, including the once_flag and callable types, and demonstrates its use with a logger instance. The tutorial compares call_once with other initialization methods like Meyers Singleton and function local statics, highlighting their efficiency and thread safety. It also discusses alternative functions for non-C++11 environments, such as InitOnceExecuteOnce on Windows and pthread_once on Linux, advising on their use based on thread types. The video concludes with a recommendation to use call_once for standard threads.

Describe the behavior of the call once function when multiple threads invoke it simultaneously.

What alternatives to call once are suggested for different operating systems?