Complete Modern C++ - Parallel Algorithms - I

The video tutorial introduces parallel STL algorithms in C++17, which allow operations to be executed on multiple threads. It explains the concept of execution policies, which determine whether an algorithm runs serially or parallelly. The tutorial covers three types of execution policies: sequenced, parallel, and parallel unsequenced, each with different execution characteristics. It also lists algorithms that have been parallelized in C++17 and provides examples of their usage.

What is the primary difference between default STL algorithms and their parallel versions introduced in C++17?

• Parallel versions execute on a single thread.

• Parallel versions can execute on multiple threads.

• Parallel versions are slower than serial versions.

• Parallel versions do not use execution policies.

What is the purpose of an execution policy in parallel algorithms?

• To decide whether the algorithm should run serially or parallelly.

• To specify the algorithm's execution speed.

• To define the algorithm's memory usage.

• To determine the algorithm's output format.

Which execution policy ensures that operations are performed sequentially, element by element?

• Parallel policy

• Parallel unsequenced policy

• Sequenced policy

• Threaded policy

What does the parallel unsequenced policy allow in terms of execution?

• Execution on a single core

• Parallel execution without vectorization

• Parallel, vectorized, or thread-migrated execution

• Only sequential execution

What happens when you invoke a parallelized algorithm in C++17?

• It only works with new algorithms.

• It executes without any threads.

• It creates multiple threads to perform operations.

• It runs on a single thread.