vs2012中将数组视图作为容器 [英] Array view as a container in vs2012

问题描述

大家好！我正在VS 2012上使用C ++ AMP，并尝试在没有数据源(仅传递大小)的情况下创建array_view.使用VS 2013，我们可以使用新添加的构造函数来实现.有什么解决方案/补丁要制作 可以在VS 2012上使用.

Hi guys! I am working with C++ AMP on VS 2012 and trying to create array_view without data source(passing just size). With VS 2013  we can make it with newly added constructor. Is there any solution / patch to make it working with VS 2012.

我正在使用类对象，并且在我的代码中有一种情况，如果我使用new()创建concurrency :: array，则需要在不使用源数组的情况下在设备上创建内存动态分配)，然后在构造函数中释放 它不能作为指针(我需要保留为类的数据成员)在parallel_for_each内部.我有一个以array_view作为数据成员的类，整个类都在parallel_for_each内部.

I am working with class objects and have a situation in my code that I need to create memory on device without using source array, if I create concurrency::array with new(dynamic allocation) inside the constructor an then free it which is not possible as pointer(which I need to keep as data member of class) are not allowed inside parallel_for_each. I have class which has array_view as data member and entire class is going inside parallel_for_each.

谢谢

推荐答案

嗨_jay，

感谢您积极使用C ++ AMP.不带源的Array_view是VS 2013中添加的功能.目前，我们尚无计划将此功能提供给早期版本.

Thank you for actively using C++ AMP. Array_view without source is a feature added in VS 2013. At this point of time, we don't have plans to make this feature available for earlier versions.

使用'concurrency :: array'，您的问题仍然可以解决.与其在p_f_e中捕获数据成员"，不如创建对该数据成员的本地引用，然后在p_f_e内部捕获本地引用.

Using 'concurrency::array', your problem can still be solved. Instead of capturing the 'data member' inside p_f_e, create a local reference to that data member and capture the local reference inside your p_f_e.

下面是它的简单示例:

A级
{
  array< int> * a;

class A
{
 array<int> *a;

  public:
   A()
   {
  &stb :: cout<< "创建并发::数组对象<< std :: endl;
   a =新数组< int>(256);
  }

 public:
  A()
  {
   std::cout << " Creating concurrency::array Object " << std::endl;
   a = new array<int>(256);
  }

   void p_f_e_function()
   {
   array< int> & temp_a = * a;
    parallel_for_each(temp_a.extent，[& temp_a](index< 1>& idx)限制(amp)
    {
    temp_a [idx] = 255;
   });

  void p_f_e_function()
  {
   array<int> &temp_a = *a;
   parallel_for_each(temp_a.extent,[&temp_a](index<1>& idx) restrict(amp)
   {
    temp_a[idx] = 255;
   });

   std :: vector< int>输出(256);
   copy(* a，output.begin());//我正在使用* a 来访问GPU内存中的内容.
   for(int i = 0; i< output.size(); i ++)
    {
       if(output [i]！= 255)
      {
          std :: cout<< "失败于"<<我<<  " ...预期255:实际" <<输出[i]<< std :: endl;
      }
   }
  }
  
  〜A()
   {
  &stb :: cout<< "释放并发::数组对象<< std :: endl;
   删除a;
  }
};

   std::vector<int> output(256);
   copy(*a,output.begin());  // I am using *a to access the content in GPU memory.
   for(int i = 0; i < output.size() ; i++)
   {
       if(output[i] != 255)
       {
           std::cout << " Failed at " << i <<  " ... Expected 255 : Actual " << output[i] << std::endl;
       }
   }
  }
  
  ~A()
  {
   std::cout << " Freeing concurrency::array Object " << std::endl;
   delete a;
  }
};

让我们知道这是否可以解决您的问题.

Let us know if this solves your problem.

这篇关于vs2012中将数组视图作为容器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！