I am currently attempting to use the thrust::remove function on a thrust::device_vector of structs in my main function as shown bellow:
#include <iostream>
#include <thrust/device_vector.h>
#include <thrust/host_vector.h>
#include <thrust/execution_policy.h>
#include <thrust/remove.h>
struct config {
unsigned int ld, ve, rd, solution;
config() = default;
};
int main() {
int n = 0;
//initialize starting configuration
int curr_size = 1, next_size;
thrust::device_vector<config> curr(1);
curr[1] = {0, 0, 0, 0};
thrust::device_vector<config> next;
thrust::device_vector<int> sums;
for (int level = 0; level < ceil(n/2.0); ++level) {
sums = thrust::device_vector<int>(curr_size);
next = thrust::device_vector<config>(curr_size * n);
thrust::fill(next.begin(), next.end(), config{0,0,0,0});
next_size = thrust::reduce(thrust::device, sums.begin(), sums.end());
//erroring code
thrust::remove(thrust::device, curr.begin(), curr.end(), 0);
next.resize(next_size);
curr = thrust::device_vector<config>(next);
}
}
however compiling the program leads to 9 compiler errors indicating invalid type conversions. I have attempted common fixes to thrust::remove errors such as running as a 64-bit project and even attempted it on a device_vector of ints but keep getting the same errors. Errors Shown Bellow(reduced due to character count limitations)
FAILED: CMakeFiles/Solver.dir/main.cu.o
/usr/local/cuda-13.0/bin/nvcc -forward-unknown-to-host-compiler -g "--generate-code=arch=compute_89,code=[compute_89,sm_89]" -MD -MT CMakeFiles/Solver.dir/main.cu.o -MF CMakeFiles/Solver.dir/main.cu.o.d -x cu -rdc=true -c /home/aowyn/CLionProjects/Solver/main.cu -o CMakeFiles/Solver.dir/main.cu.o
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: function "cuda::std::__4::__not_fn_t<_Fn>::operator()(_Args &&...) & [with _Fn=thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>>, _Args=<config &>, __cccl_true_=true, <unnamed>=0]" (declared at line 62 of /usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cuda/std/__functional/not_fn.h) cannot be referenced -- it is a deleted function
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: invalid type conversion
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: function "cuda::std::__4::__not_fn_t<_Fn>::operator()(_Args &&...) & [with _Fn=thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>>, _Args=<config &>, __cccl_true_=true, <unnamed>=0]" (declared at line 62 of /usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cuda/std/__functional/not_fn.h) cannot be referenced -- it is a deleted function
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: invalid type conversion
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: function "cuda::std::__4::__not_fn_t<_Fn>::operator()(_Args &&...) & [with _Fn=thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>>, _Args=<config &>, __cccl_true_=true, <unnamed>=0]" (declared at line 62 of /usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cuda/std/__functional/not_fn.h) cannot be referenced -- it is a deleted function
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: invalid type conversion
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: function "cuda::std::__4::__not_fn_t<_Fn>::operator()(_Args &&...) & [with _Fn=thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>>, _Args=<config &>, __cccl_true_=true, <unnamed>=0]" (declared at line 62 of /usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cuda/std/__functional/not_fn.h) cannot be referenced -- it is a deleted function
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/cub/agent/agent_select_if.cuh(407): error: invalid type conversion
selection_flags[ITEM] = static_cast<bool>(select_op(items[ITEM]));
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/thrust/detail/function.h(44): error: no instance of function template "thrust::THRUST_300001_SM_890_NS::detail::functional::actor<Eval>::operator() [with Eval=thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>]" matches the argument list
argument types are: (config)
object type is: thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>>
return static_cast<Result>(m_f(thrust::raw_reference_cast(::cuda::std::forward<Ts>(args))...));
^
/usr/local/cuda-13.0/targets/x86_64-linux/include/cccl/thrust/detail/functional/actor.h(59): note #3327-D: candidate function template "thrust::THRUST_300001_SM_890_NS::detail::functional::actor<Eval>::operator() [with Eval=thrust::THRUST_300001_SM_890_NS::detail::functional::composite<thrust::THRUST_300001_SM_890_NS::detail::functional::operator_adaptor<cuda::std::__4::equal_to<void>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::argument<0U>>, thrust::THRUST_300001_SM_890_NS::detail::functional::actor<thrust::THRUST_300001_SM_890_NS::detail::functional::value<int>>>]" failed deduction
auto operator()(Ts&&... ts) const -> decltype(Eval::eval(::cuda::std::forward<decltype(ts)>(ts)...))
9 errors detected in the compilation of "/home/aowyn/CLionProjects/Solver/main.cu".
ninja: build stopped: subcommand failed.
Any suggestions on how to fix this would be greatly appreciated, thank you.
Signature of remove is
template<typename DerivedPolicy, typename ForwardIterator, typename T>
ForwardIterator thrust::remove(
const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
const T &value,
)
The last argument should be of type T (or something implicitly convertible to T), but you used 0. If you mean to remove the config element that is {0, 0, 0, 0}, the quick fix could be:
struct config {
unsigned int ld, ve, rd, solution;
// default possible since c++20, otherwise you need to implement it
bool operator==(const config&) const = default;
};
and then
thrust::remove(thrust::device, curr.begin(), curr.end(), config{0, 0, 0, 0});
Note the defaulted comparison operator. You don't need to explicitly declare default constructor.