用C元素智能操作++ [英] Element-wise operations in C++

问题描述

有没有preexisting库，可以让我创建一​​个具有以下属性类似数组的对象：

Is there a preexisting library that will let me create array-like objects which have the following properties:

1. 运行时间尺寸规格（在instantition选择，没有长大以后或缩小）


2. 符重载执行元素方式操作（即 C = A + B 将导致一个vector C 与 C [I] = A [I] + b [I] 所有 I ，同样为 * ， - ， / 等）


3. 一套好的它作用的elementwise，例如 X =开方（VEC）将元素 X [I] =开方（VEC功能[I]）


4. 提供总结的功能，例如总和（VEC），平均值（VEC）等


5. （可选的）的操作可以被发送到用于处理的GPU。

1. Run time size specification (chosen at instantition, not grown or shrunk afterwards)
2. Operators overloaded to perform element wise operations (i.e. c=a+b will result in a vector c with c[i]=a[i]+b[i] for all i, and similarly for *, -, /, etc)
3. A good set of functions which act elementwise, for example x=sqrt(vec) will have elements x[i]=sqrt(vec[i])
4. Provide "summarising" functions such as sum(vec), mean(vec) etc
5. (Optional) Operations can be sent to a GPU for processing.

基本上类似阵列Fortran中工作，与所有隐藏的执行方式。目前我使用矢量从STL和手动重载运营商，但我觉得这可能是一个解决的问题。

Basically something like the way arrays work in Fortran, with all of the implementation hidden. Currently I am using vector from the STL and manually overloading the operators, but I feel like this is probably a solved problem.

推荐答案

在标准库中，每个人都早已被人遗忘的角落尘土飞扬，坐在一类称为的valarray 。看看它，看看它是否适合你的需要。

In the dusty corners of standard library, long forgotten by everyone, sits a class called valarray. Look it up and see if it suits your needs.

从CP preference.com 手册页：

From manual page at cppreference.com:

的std :: valarray的重presenting和操作值数组类。它支持元素明智的数学运算和各种形式的推广下标运算符，切片和间接访问的。

std::valarray is the class for representing and manipulating arrays of values. It supports element-wise mathematical operations and various forms of generalized subscript operators, slicing and indirect access.

一个code片段加以说明：

A code snippet for illustration:

#include <valarray>
#include <algorithm>
#include <iterator>
#include <iostream>

int main()
{
    std::valarray<int> a { 1, 2, 3, 4, 5};
    std::valarray<int> b = a;
    std::valarray<int> c = a + b;
    std::copy(begin(c), end(c),
        std::ostream_iterator<int>(std::cout, " "));
}

输出： 2 4 6 8 10

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