Question

我正在尝试使用cuda 7.5.18和gcc 5.4.0编译c++ nvcc文件并遇到错误。采用以下简单示例：

#include <thrust/functional.h>

struct test_struct {
    //..
}

void f(test_struct& a) {
    //..
}

int main() {
    test_struct a;
    std::function<void()> bound_f = std::bind(f, std::ref(a));
}

使用nvcc -c -std=c++11 test.cu -o test.o编译此代码会导致以下错误输出：

/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include/c++/functional(78): error: class "test_struct" has no member "result_type"
          detected during:
            instantiation of class "std::_Maybe_get_result_type<_Functor, void> [with _Functor=test_struct]" 
(86): here
            instantiation of class "std::_Weak_result_type_impl<_Functor> [with _Functor=test_struct]" 
(184): here
            instantiation of class "std::_Weak_result_type<_Functor> [with _Functor=test_struct]" 
(264): here
            instantiation of class "std::_Reference_wrapper_base_impl<true, true, _Tp> [with _Tp=test_struct]" 
(283): here
            instantiation of class "std::_Reference_wrapper_base<_Tp> [with _Tp=test_struct]" 
(399): here
            instantiation of class "std::reference_wrapper<_Tp> [with _Tp=test_struct]" 
test.cu(14): here

/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include/c++/functional(266): error: class "test_struct" has no member "argument_type"
          detected during:
            instantiation of class "std::_Reference_wrapper_base_impl<true, true, _Tp> [with _Tp=test_struct]" 
(283): here
            instantiation of class "std::_Reference_wrapper_base<_Tp> [with _Tp=test_struct]" 
(399): here
            instantiation of class "std::reference_wrapper<_Tp> [with _Tp=test_struct]" 
test.cu(14): here

/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include/c++/functional(267): error: class "test_struct" has no member "first_argument_type"
          detected during:
            instantiation of class "std::_Reference_wrapper_base_impl<true, true, _Tp> [with _Tp=test_struct]" 
(283): here
            instantiation of class "std::_Reference_wrapper_base<_Tp> [with _Tp=test_struct]" 
(399): here
            instantiation of class "std::reference_wrapper<_Tp> [with _Tp=test_struct]" 
test.cu(14): here

/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/include/c++/functional(268): error: class "test_struct" has no member "second_argument_type"
          detected during:
            instantiation of class "std::_Reference_wrapper_base_impl<true, true, _Tp> [with _Tp=test_struct]" 
(283): here
            instantiation of class "std::_Reference_wrapper_base<_Tp> [with _Tp=test_struct]" 
(399): here
            instantiation of class "std::reference_wrapper<_Tp> [with _Tp=test_struct]" 
test.cu(14): here

5 errors detected in the compilation of "/tmp/tmpxft_00003b29_00000000-7_test.cpp1.ii".

我无法找到与行error: ... has no member "second_argument_type"相关的任何nvcc等等，所以我完全无能为力。显然，找不到std::function的班级成员（见here）。

我可以做些什么来解决这个问题？

Answer 1

错误的原因尚不清楚，但您可以轻松解决lambda：

int main()
{
    int a,b,c,x;
    printf("Enter a & b \n");    //printing
    scanf("%d %d, &a,&b");
    printf("1. add \n 2. sub \n 3. multiply \n 4. div \n 5. mod \n 6. and \n 7. or\n 8. not \n 9. xor \n");
    printf("Enter your choice \n");
    scanf("%d, &x");

    switch(x)
    {
        case 1: c=a+b;
                break;

        case 2: c=a-b;
                break;

        case 3: c=a*b;
                break;

        case 4: c=a/b;
                break;

        case 5: c=a%b;
                break;

        case 6: c=a && b;
                break;

        case 7: c=a || b;
                break;        

        case 8: c=~a;
                break;

        case 9: c=a^b;
                break;

        default: printf("Make correct choice\n");
    }

    printf("result is: %d",c);
    return 0;
}

class没有成员＆＃34; second_argument_type＆＃34;当使用std :: ref（）和nvcc时

1 个答案: