这是我第一次尝试使用 RcppParallel 包,我必须使用C++17 (Ubuntu)
我试图靠近开发人员站点的ParallelFor示例,但我需要一个额外的(非迭代)参数用于 worker threshold
。
这是我当前的代码
struct ReplaceWorker : public Worker
{
// source matrix
const RMatrix<double> input;
// destination matrix
RMatrix<double> output;
// threshold
double th;
// initialize with source and destination
ReplaceWorker(const NumericMatrix input, NumericMatrix output, double threshold)
: input(input), output(output), th(threshold) {}
// replace function
template<typename T>
double replacer(const T &x){
if(x < th){
return(0);
} else {
return(1);
}
}
// take the square root of the range of elements requested
void operator()(std::size_t begin, std::size_t end) {
std::transform(input.begin() + begin,
input.begin() + end,
output.begin() + begin,
replacer);
}
};
但是我总是以相同的编译错误结束:
usr/include/c++/7/bits/stl_algo.h:4295:5: note: candidate: template<class _IIter, class _OIter, class _UnaryOperation> _OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation)
transform(_InputIterator __first, _InputIterator __last,
^~~~~~~~~
/usr/include/c++/7/bits/stl_algo.h:4295:5: note: template argument deduction/substitution failed:
network_edge_strength.cpp:173:28: note: couldn't deduce template parameter ‘_UnaryOperation’
replacer);
^
/usr/include/c++/7/bits/stl_algo.h:4332:5: note: candidate: template<class _IIter1, class _IIter2, class _OIter, class _BinaryOperation> _OIter std::transform(_IIter1, _IIter1, _IIter2, _OIter, _BinaryOperation)
transform(_InputIterator1 __first1, _InputIterator1 __last1,
^~~~~~~~~
/usr/include/c++/7/bits/stl_algo.h:4332:5: note: template argument deduction/substitution failed:
network_edge_strength.cpp:173:28: note: candidate expects 5 arguments, 4 provided
replacer);
^
任何建议,如何解决此问题或替代方案,如何使其以所需的threshold
参数运行?