C++ 将变量作为引用传递给C++；

我试着让几个线程同时计算平均值、最小值、最大值和标准偏差

如下所示（T是一个100大小的双数组）：

在方法中：

void average(double* T, double &average) {
double sum=0.0;
for(int i=0;i<100;i++){
    sum +=T[i];
}
average = sum/100;  
}

但它失败并显示此错误：

In file included from /usr/include/c++/4.8/thread:39:0,
             from ejercicio_4.cpp:2:
/usr/include/c++/4.8/functional: In instantiation of ‘struct std::_Bind_simple<double*(double*, std::reference_wrapper<double>)>’:
/usr/include/c++/4.8/thread:137:47:   required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = double*; _Args = {double (&)[100], std::reference_wrapper<double>}]’
ejercicio_4.cpp:89:40:   required from here
/usr/include/c++/4.8/functional:1697:61: error: no type named ‘type’ in ‘class std::result_of<double*(double*, std::reference_wrapper<double>)>’
       typedef typename result_of<_Callable(_Args...)>::type result_type;
                                                             ^
/usr/include/c++/4.8/functional:1727:9: error: no type named ‘type’ in ‘class std::result_of<double*(double*, std::reference_wrapper<double>)>’
         _M_invoke(_Index_tuple<_Indices...>)
         ^

在/usr/include/c++/4.8/thread:39:0中包含的文件中，
来自ejercicio_4.cpp:2：
/usr/include/c++/4.8/functional:在“struct std:_Bind_simple”的实例化中：
/usr/include/c++/4.8/thread:137:47:从'std:：thread:：thread（_Callable&&，_Args&&…[with _Callable=double*；_Args={double（&）[100]，std:：reference_wrapper}]中需要'
ejercicio_4.cpp:89:40:从这里开始需要
/usr/include/c++/4.8/functional:1697:61:错误：在'class std:：result_of'中没有名为'type'的类型
typedef typename result_of:：type result_type；
^
/usr/include/c++/4.8/functional:1727:9:错误：在'class std:：result_of'中没有名为'type'的类型
_M_invoke（_Index_tuple）
^

我有g++4.8，所以它应该与线程一起工作，我不知道是什么导致了这个错误

---

提前感谢。

第一行有一个输入错误或名称冲突，您将函数名（

average

）而不是目标变量的名称作为第二个参数传递。你可能想写的是：

double avg;
P[0] = thread(&average, T, ref(avg));

---

也许这不是打字错误，而是名字冲突哇！就这样！我不敢相信我错过了，我是如此确定这是一个参考错误，我没有意识到，谢谢！！你能提供一个最小的测试用例吗？

In file included from /usr/include/c++/4.8/thread:39:0,
             from ejercicio_4.cpp:2:
/usr/include/c++/4.8/functional: In instantiation of ‘struct std::_Bind_simple<double*(double*, std::reference_wrapper<double>)>’:
/usr/include/c++/4.8/thread:137:47:   required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = double*; _Args = {double (&)[100], std::reference_wrapper<double>}]’
ejercicio_4.cpp:89:40:   required from here
/usr/include/c++/4.8/functional:1697:61: error: no type named ‘type’ in ‘class std::result_of<double*(double*, std::reference_wrapper<double>)>’
       typedef typename result_of<_Callable(_Args...)>::type result_type;
                                                             ^
/usr/include/c++/4.8/functional:1727:9: error: no type named ‘type’ in ‘class std::result_of<double*(double*, std::reference_wrapper<double>)>’
         _M_invoke(_Index_tuple<_Indices...>)
         ^

double avg;
P[0] = thread(&average, T, ref(avg));