I hit an issue this week while working with parallel::for_each over
partitioned_vectors. parallel::for_each works well over std::vector types
but, when attempting to perform a parallel::for_each over
partitioned_vectors, gcc complains that the lambda function I'm supplying
isn't a structure with an overloaded operator().
The code below works well:
std::vector<int> vec(100);
int value = 100;
hpx::parallel::transform(
hpx::parallel::execution::par,
std::begin(vec),
std::end(vec),
std::begin(vec),
[&value](int val) {
return value;
});
hpx::parallel::for_each(
hpx::parallel::execution::par,
std::begin(vec),
std::end(vec),
[](int val) {
hpx::cout << val << hpx::endl;
});
The code below fails to compile:
hpx::partitioned_vector<int> vec(100,
hpx::container_layout(hpx::find_all_localities()));
vec.register_as("intvectors");
int value = 100;
hpx::parallel::transform(
hpx::parallel::execution::par,
std::begin(vec),
std::end(vec),
std::begin(vec),
[&value](int val) {
return value;
});
hpx::parallel::for_each(
hpx::parallel::execution::par,
std::begin(vec),
std::end(vec),
[](int val) {
hpx::cout << val << hpx::endl;
});
gcc throws a compiler error on the line where the for_each is supplied the
lambda. The error implies that parallel::for_each requires/expects a data
type similar to std::plus<int>() with an overloaded operator().
Did I make an error, find a new error, or is this an edge case?
V/r,
Chris
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