如何在C ++中模拟解构？ [英] How can I emulate destructuring in C++?

问题描述

在JavaScript ES6中，有一种称为解构的语言功能。

In JavaScript ES6, there is a language feature known as destructuring. It exists across many other languages as well.

在JavaScript ES6中，它如下所示：

In JavaScript ES6, it looks like this:

var animal = {
    species: 'dog',
    weight: 23,
    sound: 'woof'
}

//Destructuring
var {species, sound} = animal

//The dog says woof!
console.log('The ' + species + ' says ' + sound + '!')

我可以在C ++中做些什么来获得类似的语法并模仿这种功能？

What can I do in C++ to get a similar syntax and emulate this kind of functionality?

推荐答案

std :: tie 看起来很相似：

For the specific case of std::tuple (or std::pair) objects, C++ offers the std::tie function which looks similar:

std::tuple<int, bool, double> my_obj {1, false, 2.0};
// later on...
int x;
bool y;
double z;
std::tie(x, y, z) = my_obj;
// or, if we don't want all the contents:
std::tie(std::ignore, y, std::ignore) = my_obj;

我不知道一种符合你的方法。

I am not aware of an approach to the notation exactly as you present it.

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