C++ 2011 : std::thread : simple example to parallelize a loop?

Question

C++ 2011 includes very cool new features, but I can\'t find a lot of example to parallelize a for-loop. So my very naive question is : how do you parallelize a simple for lo

Answer 1

Define macro using std::thread and lambda expression:

#ifndef PARALLEL_FOR
#define PARALLEL_FOR(INT_LOOP_BEGIN_INCLUSIVE, INT_LOOP_END_EXCLUSIVE,I,O)          \                                                               \
    {                                                                               \
        int LOOP_LIMIT=INT_LOOP_END_EXCLUSIVE-INT_LOOP_BEGIN_INCLUSIVE;             \
        std::thread threads[LOOP_LIMIT]; auto fParallelLoop=[&](int I){ O; };       \
        for(int i=0; i

usage:

int aaa=0; // std::atomic aaa;
PARALLEL_FOR(0,90,i,
{
    aaa+=i;
});

its ugly but it works (I mean, the multi-threading part, not the non-atomic incrementing).