Erroneous Techniques in Parallel Algorithms

Erroneous Technique

It’s also important to mention one aspect:

As the standard says in algorithms.parallel.exec:

Unless otherwise stated, implementations may make arbitrary copies of elements (with type T) from sequences where is_­trivially_­copy_­constructible_­v<T> and is_­trivially_­destructible_­v<T> are true. [Note: This implies that user-supplied function objects should not rely on object identity of arguments for such input sequences. Users for whom the object identity of the arguments to these function objects is important should consider using a wrapping iterator that returns a non-copied implementation object such as reference_­wrapper or some equivalent solution.]

Thus you cannot write: