在 C + + 11基于范围的 for 循环中使用 OpenMP？

小开

The OpenMP 4.0 specification was finalised and published several days ago here. It still mandates that parallel loops should be in the canonical form (§2.6, p.51):

for (init-expr; test-expr; incr-expr) structured-block

The standard allows for containers that provide random-access iterators to be used in all of the expressions, e.g.:

#pragma omp parallel for
for (it = v.begin(); it < v.end(); it++)
{
...
}

If you still insist on using the C++11 syntactic sugar, and if it takes a (comparatively) lot of time to process each element of stl_container, then you could use the single-producer tasking pattern:

#pragma omp parallel
{
#pragma omp single
{
for (auto x : stl_container)
{
#pragma omp task
{
// Do something with x, e.g.
compute(x);
}
}
}
}

Tasking induces certain overhead so it would make no sense to use this pattern if compute(x); takes very little time to complete.