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Listing 9.3 - Compile Error #48

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Listing 9.3 - Compile Error #48

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54a32a4
include `accumulate_block()` struct
ITHelpDec Jul 28, 2023
773b41d
complete call to `accumulate_block()`
ITHelpDec Jul 28, 2023
687189f
mirror example from book
ITHelpDec Jul 28, 2023
e78bb10
correct lambda function
ITHelpDec Jul 28, 2023
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12 changes: 11 additions & 1 deletion listings/listing_9.3.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,14 @@
#include <future>
#include <thread>

template <typename _ForwardIt, typename _Tp>
struct accumulate_block {
_Tp operator() (_ForwardIt __first, _ForwardIt __last)
{
return std::accumulate(__first, __last, __Tp{});
}
};

template<typename Iterator,typename T>
T parallel_accumulate(Iterator first,Iterator last,T init)
{
Expand All @@ -21,7 +29,9 @@ T parallel_accumulate(Iterator first,Iterator last,T init)
{
Iterator block_end=block_start;
std::advance(block_end,block_size);
futures[i]=pool.submit(accumulate_block<Iterator,T>());
futures[i]=pool.submit([=] {
return accumulate_block<Iterator,T>()(block_start,block_end);
});
block_start=block_end;
}
T last_result=accumulate_block()(block_start,last);
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