The simplified code below will not compile with Intel Compiler C++ 2022 ( C++17 and OpenMP on , obviously).
It compiles with classic 19.2 and runs correctly.
1>ConsoleApplication2.cpp(28,14): : error : reference to local binding 'a' declared in enclosing context
1> DoTask(a, aa);
1> ^
1>ConsoleApplication2.cpp(21,22): note: 'a' declared here
1> for (const auto& [a, b] : data)
#include <iostream>
#include <tuple>
#include <vector>
std::vector<std::pair<int, std::vector<int>>> data;
void DoTask(int a, int b)
{
}
void test()
{
# pragma omp parallel
{
# pragma omp single
{
for (const auto& [a, b] : data)
{
for (const auto& aa : b)
{
if (aa != a)
{
# pragma omp task
DoTask(a, aa);
}
}
}
}
}
}
The workaround is to use functionally identical code that avoids using the C++17 syntactic sugar
void test2()
{
# pragma omp parallel
{
# pragma omp single
{
for ( auto iter =data.begin(); iter!=data.end(); ++iter)
{
const auto &a=iter->first;
const auto &b=iter->second;
for (const auto& aa : b)
{
if (aa != a)
{
# pragma omp task
DoTask(a, aa);
}
}
}
}
}
}
