Safety of concurrent_vector
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25-05-2021 - |
题
it is known that operator [] is not concurrently safe for writing:
concurrent_vector::operator[] Operator
But what if I guarantee that different threads will write to different vector positions.
Like this (very much simplified example):
concurrent_vector<double> vec;
vec.resize(100);
parallel_for(0, 100, [&] (double ind)
{
vec[ind] = ind*ind;
}
Is it concurrently safe or not? And if 'not' then why?
Thanks
解决方案
Yes, it is concurrently safe as it's like if you are accessing different variables.
As ildjam pointed out in the comment that would be safe even with regular std::vector
or, let me add, with simple arrays.
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