void foo（int& x） - >红宝石？通过引用传递整数？ [英] void foo(int &x) -> Ruby? Passing integers by reference?
问题描述
作为一种调整我的C ++编程作业的方式，我决定不是从书中打开C ++到我的电脑，而是在Ruby中改造它。是的有点傻，但我很无聊。
as a way to spice up my C++ programming homework, I've decided to instead of typing the C++ from the book onto my computer, instead reforming it in Ruby. Yes it's a bit silly, but I'm bored.
无论如何，我无法将此类函数转换为Ruby
Anyway, I'm having trouble converting this kind of function to Ruby
void swap(int &a,int &b){
int c=b;
b=a;
a=c
}
什么是等效的ruby代码内部函数？
What would be the equivalent ruby code inside a function ?
推荐答案
Ruby是严格按值传递的。总是。
Ruby is strictly pass-by-value. Always. But sometimes those values are poointers.
以下是几个链接：
- Java是pass-by-value，Dammit！ （ScottJavaDudeStanchfield）
- 在Java中传递参数Skeet）
- Java是否通过引用？
- Java，pass-by-value，reference变量
- Java is Pass-by-Value, Dammit! (Scott "JavaDude" Stanchfield)
- Parameter passing in Java (Jon Skeet)
- Does Java pass by reference?
- Java, pass-by-value, reference variables
请注意，虽然所有这些都说Java，他们应该真正说Smalltalk及其后代其中包括Java，Ruby和其他语言。
Note that while all of these say "Java", they should really say "Smalltalk and its descendants", which includes Java, Ruby and a ton of other languages.
我认为大部分的混乱来自两个问题：
I think most of the confusion stems from two problems:
- Ruby按值传递引用。但该句中的参考一词与参考中的参考一词不同。也许在我们消除歧义时更清楚：让我们用指针替换通过引用传递和引用（注意，这些是好的良好的poointers，而不是坏的from C）：
- Fortran是通过变量
- Ruby是pass-by-value，
- 持久数据结构和管理引用 - Clojure的身份和状态方法 - Rich Hickey - QCon London 2009
- 我们还在吗？ - 面向对象时间的解构 - Rich Hickey - JVM语言峰会
- Persistent Data Structures and Managed References - Clojure's Approach to Identity and State - Rich Hickey - QCon London 2009
- Are We There Yet? - A deconstruction of object-oriented time - Rich Hickey - JVM Language Summit
BTW：我故意用面向对象的OO拼写poointers，以清楚地说明我不是在谈论原始内存地址，我说的是对对象的不透明引用（并且出于显而易见的原因，我不想要使用单词reference;如果你知道一个更好的单词既不是指针也不是参考，我很想听到它）。
BTW: I deliberately misspelt "poointers" with an OO for object-orientation to make it clear that I am not talking about raw memory addresses, I am talking about opaque references to objects (and for obvious reasons I do not want to use the word "reference"; if you know a better word that is neither "pointer" nor "reference", I'd love to hear it).
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