迭代器

在匿名迭代器中的Return语句工作方式就像C的yieldreturn一样。

A Return statement within an anonymous Iterator works just like C # 's yield return .

C的迭代器是一种延续的形式，在类似Scheme这样的流行语言中很少使用这样的技术。

C # 's iterator is a form of continuation , a rarely used technique popular in languages such as Scheme .

VisualBasic的迭代器，看上去更像一个匿名函数。

Visual Basic 's Iterators , look more like an anonymous function .

First和last申明输入迭代器，是一个模板参数。

First and last are declared to be of type InputIterator , and InputIterator is a template parameter .

尽管有些迭代器对整数索引进行了优化，但是所有迭代器都只简单地处理（key，value）对。

While some iterators are optimized for integer indices , all simply process ( key , value ) pairs .

与更加特定于域的语言特性（如C中的迭代器）相比，这种语言特性可能更为有用。

It would be likely more useful than more domain-specific language features such as iterators in C # .

Find需要三个参数：两个迭代器定义了一个区域，还有一个要查找的值。

Find takes three arguments : two iterators that define a range , and a value to search for in that range .

指针本身是迭代器，这就是为什么C数组也可以使用reverse这个函数。

Pointers themselves are iterators , which is why it is possible to reverse the elements of a C array .

而在Blue中，忽略了递归或映射（函数迭代器），只有一种方法来实现循环结构。

In Blue , ignoring recursion or map ( functional iterator ), there 's one way to implement loop constructs .

您会回忆起这个系列以前的文章中，闭包一般用于在List和Map集合上应用的迭代器方法上。

You 'll recall from previous articles in this series that closures are commonly used with iterator methods applied to List and Map collections .

在PHP中，这意味着对象可以当做迭代器。

In PHP parlance , this means that the object can be treated as an iterator .

VisualBasic团队的PaulVick最近泄露了一个计划&在一个还没有取名的版本中添加迭代器。

Visual Basic 's Paul Vick recently revealed a proposal to add iterators in a yet unnamed version .

很容易就能将Rope迭代器改成一次向前移动不止一个字符。

You can easily modify the Rope iterator to accommodate skipping forward by more than one character at a time .

Groovy将这一技术进一步发展，添加了内部迭代器作为集合API的一部分。

Groovy has taken this one step further and added internal iterators as part of the collections API .

其中最重要的差异是，序列既可编制索引，也可直接切片（slice），而迭代器不能。

The most important of these differences is that sequences can be indexed , and directly sliced , while iterators cannot .

它们与PHP中的其他迭代器类使用相同的工作方式，但是它们分别针对不同的情况。

These work the same as the other iterator classes in PHP , but they are specially designed for certain instances .

该清单展示了内部迭代器（也称为push迭代器，因为它将每个元素依次推到代码块中）。

This listing illustrates an internal iterator ( also known as a push iterator because it pushes each element in turn to the code block ) .

例如，迭代器方法collect把闭包应用到集合中的每个元素上，并返回一个带有新值的新集合。

The iterator method collect , for example , applies a closure to every element in a collection and returns a new collection with the new values .

STL和迭代器模式

STL and Iterator Design Pattern

前几个例子展示了更为现代的基于Java的语言包含了四人组模式，该语言中直接包含了迭代器和命令模式。

The first couple of examples show this exact embrace of Gang of Four patterns in more modern Java-based languages , incorporating the Iterator and Command patterns directly into the language .

中间值通过迭代器（一种可以让程序员遍历所有集合元素的对象，忽略其具体的实现）提供给用户的Reduce函数。

The intermediate values are supplied to the user 's Reduce function via an iterator ( an object that allows a programmer to traverse through all the elements of a collection regardless of its specific implementation ) .

而charAt实现直接返回char原语，迭代器实现必须将每个char装箱为一个Character对象。

Although the charAt implementation directly returns char primitives , the iterator implementation must box each char into a Character object .

迭代器的内容按顺序写入，首先是字符串JavaBridge！，然后是JavaDate对象，最后是包含五个数字的PHP数组。

The contents of the iterator are written in order , starting with the string Java Bridge !, then the Java Date object , and finishing with the PHP array containing five numbers .

RUP过程鼓励复用，设计过程中使用很多设计模式来增加复用性，如抽象工厂、观察者模式和迭代器模式等。

Design patterns are also used to increase the reusability as RUP advocated . The abstract factory , observer and iterator patterns is introduced .

但是向后移动要复杂些，因为迭代器内部执行的是深度优先算法，预先排好了Rope遍历的顺序，需要访问每个叶节点。

But moving backward is more complicated , because internally the iterator performs a depth-first , preorder traversal of the Rope , visiting each of its leaf nodes .

还出现了iter（）内置函数，它可以将许多类似于序列的对象转换为迭代器。

We have the iter () built-in function to turn many sequence-like objects into iterators .

所有类序列或类迭代器的主要相似之处是，它们都允许进行循环遍历，无论是使用for循环、列表理解（listcomprehension）还是生成器理解（generatorcomprehension）。

The main point of similarity is that everything that is sequence-or iterator-like lets you loop over it , whether using a for loop , a list comprehension , or a generator comprehension .

在这里，我跳过了Iterator接口，直接在集合上使用类似迭代器的方法。

Here , I get to bypass the Iterator interface and use iterator-like methods on collections themselves .

可以将for循环与提供迭代器的任何Python对象结合使用，这些对象包括tuple、string和list等内置序列类型。

You can use the for loop with any Python object that provides an iterator , including the built-in sequence types such as the tuple , string , and list .

如果你了解算法，迭代器，容器，那么你基本上知道STL的一切。

If you understand algorithms , iterators , and containers , then you understand almost everything there is to know about the STL .