是否可能将我的循环转换为parallel_for fnc调用？

问题描述

我有一个for循环，我想转换为parallel_for fnc调用。我的代码符合所有的条件（描述在Parallel_Programming_with_Microsoft_Visual_C_plus_plus，第7页），这个转换是成功的，但我发现很难实现。这是我的例子：

I'm having a for loop which I would like to convert into parallel_for fnc invocation. My code meets all the criteria (described in Parallel_Programming_with_Microsoft_Visual_C_plus_plus,p.7) for this conversion to be successfull, yet I find it difficult to implement. Here is my example:

//"Oridinary" for
//numbers_from_file_ is a vector<Big_Int> loaded with Big_Int 
//results_ is a vector<Big_Int>

for (unsigned i = 0; i < numbers_from_file_.size(); i += 2)//+2 to skip to another pair
{
    results_.push_back( numbers_from_file_[i] * numbers_from_file_[i + 1]);
}

这种情况是，来自numbers_from_file_的每对数字都被放大并存储在results_。为了使其工作，变量i必须递增2（跳到另一对）。不幸的是，在这本书中的例子显示如何将for循环的主体转换为parallel_for fnc调用，只有当i增加1时。

是否可以将我的循环转换为parallel_for fnc调用？

The scenario is that each pair of numbers from numbers_from_file_ is multiplied out and stored in results_. In order to make it work the variable i has to be incremented by two (to skip to another pair). Unfortunately example in this book is showing how to convert body of for loop into parallel_for fnc invocation only if i is being incremented by one.
Is it possible to convert my loop into parallel_for fnc invocation?

推荐答案

说，有一个步骤参数。使用它。

MSDN says that there is a step parameter. Use it.

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