234-C++11的auto和lambda

阳光穿透心脏的1/2处 2022-11-11 13:23 120阅读 0赞

## C++11的auto使用方法 ##

auto在C语言已经失去了意义  
**我们来谈谈C++11的auto使用方法**

**我们上代码**

**示例1：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center]  
这里的x和y的类型我们没有确定，但是有了上面a和ft的定义，auto可以推导出x是整型，y是double型。x和y分别会被自动识别成int,double型。  
不过这里使用auto去编程的可读性很差，如果没有a和ft的定义，auto还要根据数据去定义类型。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 2]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 4]  
**示例2：**  
auto的另一个作用：可以推导出函数的返回类型。  
![在这里插入图片描述][20210320201527418.png_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 5]  
**示例3：**  
这里的x就是指向函数add的函数指针  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 7]  
**示例4：**  
把构建好的对象给给x  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 8]  
**auto使得简化了对类型的定义**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 9]  
这里必须是实体的对象去给给x

## decltype的使用 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 10]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 11]  
**这个关键字decltype的作用是识别出实体（这里的10）的类型，并且可以拿这个类型去定义新的变量。b的类型就是x的类型，x是int类型，所以b也是int 类型。**

## auto应用在容器（范围广） ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 12]  
**auto 从容器的begin()开始到末尾打印，但是不能逆向打印。**

## auto的弊端 ##

**但是auto的弊端在：人在看源码，会越看越糊涂！代码清晰度差，如果你不看函数的声明，不知道返回类型，不知道auto推导出的是什么。**  
**对代码的跟踪和识别能力差**  
**阅读源码的能力变弱**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 14]  
**如果你不知道fun的返回值，就会很糊涂！**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 15]

## C++11的lambda ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 16]  
**请问没有名字的变量有什么？**  
我们malloc申请的空间就没有名字。

**lambda是没有名字的仿函数。**

**示例1：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 18]  
把lambda的表达式给给f1，把b传进去，a=b=20;  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 19]  
**我们这里的lambda表达式是在主函数的作用域。**  
**什么叫捕获？不捕获？**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 20]  
**理解一下这句代码哪个可以哪个不可以使用？**  
![在这里插入图片描述][20210320204646235.png_pic_center]  
**lambda对全局变量和全局函数没有捕获不捕获之说。因为全局变量全局函数所有人都可以使用。lambda是匿名函数自然也可以使用全局变量全局函数。**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 21]  
**示例2：**  
捕获是对谁来讲的呢？  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 22]

**如果我们的lambda是定义在主函数里，那么它的捕获范围就是主函数的所有局部变量都可以使用。这就是捕获。**

\[\]是不捕获，所以我们不能使用主函数的局部变量。更不可能去使用其他函数的局部变量。因为lambda作用域是在主函数里面。捕获是相当于主函数（作用域）来说。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 23]

**示例3：**  
![在这里插入图片描述][20210320205356593.png_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 24]  
这样lambda可以把主函数的所有局部变量以引用的形式进行捕获。  
这里对a,b的改变就是对主函数的a,b改变。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 25]  
![在这里插入图片描述][20210320205606599.png_pic_center]  
**出现这个结果是因为我们还没调动lambda**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 26]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 27]  
**光定义lambda表达式而没有去执行调用它，就不会改变a,b的值**

一般情况下，不要拿&引用捕获，否则局部变量，局部变量在使用用lambda捕获，在其他情况可能会被调用改变了。

**示例4：**  
![在这里插入图片描述][20210320205356593.png_pic_center]  
**如果是按值捕获，系统认为你捕获进来的是常性值，不让你对其进行修改！**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 28]  
只可读取，不能修改。

**示例5：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 29]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 30]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 31]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 32]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 33]

**书写主函数进行测试：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 34]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 35]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 36]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 37]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 38]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 39]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 40]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 41]  
**lambda的聪明之处：如果没有用到，就不会构造。如果你用了，就构造了。调动拷贝构造函数创建同名对象！ 但是两个Obj是不一样的，产生了副本！！！**  
虽然名字一样，但是不是同一个对象。

**编译器很聪明，如果你不执行Obj.GetValue();不使用Obj，就不会产生写时拷贝！**

**如果我们定义了10个对象**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 42]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 43]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 44]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 45]  
**调用一个对象，但是产生了10个对象的副本。**  
捕获整个数组，形式要和数组保持一致，也要产生10个副本。

**如果是引用捕获，就不产生副本！**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 46]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 47]  
**示例6：**  
不让只捕获数组中的某一个元素。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 48]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 49]  
**示例7：**  
可以挑着捕获，可以分形式捕获。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 50]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 51]  
**写上全局的lambda是没有意义的。全局域不需要捕获。**

**示例8：**  
![在这里插入图片描述][20210320212610352.png_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 52]  
**不能捕获x，因为x是在a的块的作用域里面。**  
除非捕获函数也在a的块内  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 53]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 54]

**示例9：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 55]  
**mutable是易变关键字。在常方法中可以对mutable修饰的变量进行改变。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 56]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 57]  
打印出什么呢？？？  
虽然调用了lambda，但是没有进行打印副本，改的是副本的值。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 58]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 59]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 60]  
**示例10：**  
调动f5和调动f4一模一样  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 61]  
**示例11：**  
不能进行相互赋值  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 62]  
**示例12：**  
可以把lambda表达式赋值给函数指针  
![在这里插入图片描述][20210320214612456.png_pic_center]  
![在这里插入图片描述][20210320214630807.png_pic_center]  
但是不能把函数指针赋值给lambda表达式  
![在这里插入图片描述][20210320214733814.png_pic_center]  
**lambda表达式只能够被构建，不能去赋值**

**示例13：**

![在这里插入图片描述][20210320214906558.png_pic_center]  
可以捕获当前函数作用域的局部变量，a,b,  
这里的value来自于对象。  
但是它捕获this指针并不是捕获一个指针，而是一个对象，value是对象的value值。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 63]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 64]  
第26行可以对value++的原因是什么？  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 65]  
**我们捕获到p，不能对p进行改变，但是可以对p指向的进行改变。  
我们捕获的是this指针，this指针不能变，但是this指针所指之物可以改变！**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 66]  
**示例14：**  
具体的写到后面  
![在这里插入图片描述][20210320215651610.png_pic_center]  
![在这里插入图片描述][20210320215656210.png_pic_center]

## lambda表达式到底是什么？ ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 67]

## lambda表达式和仿函数 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 68]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 69]  
**解析：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 70]  
**构建对象传参进去for\_each函数，对count的++就是对x的++，计数。**  
**对象调动仿函数。**

下面这个是以lambda表达式  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 71]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 72]  
**lambda是仿函数的工作**

## lambda实现多线程打印 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 73]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 74]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 75]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 76]  
10个线程进来都挂起，执行go函数，唤醒所有线程。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 77]  
**用lambda去实现**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 78]  
**如果ready为真，从等待函数返回，如果ready为假，就一直等待。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xJTlpFWVU2NjY_size_16_color_FFFFFF_t_70_pic_center 79]  
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