如何遍历 boost::multi_array [英] how to traverse a boost::multi_array

问题描述

我一直在研究 boost::multi_array 库，以寻找允许您在单个 for 循环中遍历整个 multi_array 的迭代器.

I have been looking into the boost::multi_array library in search of an iterator that allows you to traverse the whole multi_array in a single for loop.

我认为那个库中没有这样的迭代器.(在那里找到的迭代器可以让你遍历 multi_array 的一个维度)

I don't think there is any such iterator in that library. (The iterators that are found there let you traverse a single dimension of the multi_array)

我错了吗?
如果没有，是否有任何库定义了这样的迭代器?

Am I wrong?
If not, is there any library that defines such an iterator?

进入细节，我想写一些类似的东西:

Entering into details, I'd like to write something like:

boost::multi_array< double, 3 > ma(boost::extents[3][4][2]);  

for( my_iterator it = ma.begin(); it != ma.end(); ++it )  
{  
    // do something  
    // here *it has element type (in this case double)  
}  

并获得重复 3x4x2 次的循环

and obtain a loop that repeats 3x4x2 times

推荐答案

您可以使用 中的 std::for_each 实现来访问每个人元素.Boost 文档

You can use an implementation of std::for_each from <algorithm> to access each individual element. There is an example in the Boost documentation

或者，您可以使用 array::origin() 和 array::num_elements() 如下:

Alternatively, you can use array::origin() and array::num_elements() as follows:

boost::multi_array< double, 3 > ma(boost::extents[3][4][2]);  

for(auto i = ma.origin(); i < (ma.origin() + ma.num_elements()); ++i)  
{  
    // do something with i
}  

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