如何遍历一个boost :: multi_array的 [英] how to traverse a boost::multi_array

问题描述

我一直在寻找到了boost :: multi_array的图书馆寻找一个迭代器，允许你遍历的全的的multi_array在一个for循环。

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.

我不认为这是在该库中的任何这样的迭代器。 （被发现存在的迭代器让你遍历的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？结果
如果没有，是否有一个定义这样一个迭代的图书馆吗？

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

进入到细节，我想写类似：

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)  
}  

和获得一个循环，重复3x4x2次

and obtain a loop that repeats 3x4x2 times

推荐答案

您可以使用的std :: for_each的的实施从＆LT;算法＆GT ; 来访问每个元素。有一个在 Boost文档一个例子

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

另外，你可以使用阵列::原点（）和阵列:: 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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