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拍卖网站咋做,进入网络管理的网站,顺德网站建设信息,大气网站建设、vector的模拟实现1.1 resize在这里插入图片描述接口作用#xff1a;当n 当前size时#xff1a;会截断为前n个元素#xff0c;超出n的元素会被移除并销毁。当当前size n ≤ 当前capacity时#xff1a;在容器末尾插入足够的元素#xff0c;使总个数达到n。新元素…、vector的模拟实现1.1 resize在这里插入图片描述接口作用当n 当前size时会截断为前n个元素超出n的元素会被移除并销毁。当当前size n ≤ 当前capacity时在容器末尾插入足够的元素使总个数达到n。新元素的初始化方式由val参数决定指定则拷贝val否则值初始化。当n 当前capacity时不仅会插入新元素还会自动重新分配存储空间扩容再完成元素插入。vector中的resize与string中的resize又有些区别其接口参数size_typevalue_size是vector这个模板类内部定义的在这里插入图片描述结合上图member type(成员类型)的表格说一下接口参数这也定义的原因size_type 定义size_type 是无符号整型通常等价于 size_t用于表示 “容器可容纳的非负元素数量”。 设计意图 「语义正确」容器的元素个数不可能为负数无符号类型更符合 “计数” 的语义。 「范围足够」size_t或其等价类型的范围远大于 int能适配大型容器如元素数量超过百万的场景避免因范围不足导致溢出。 「平台兼容」不同平台对 “整型长度” 的定义不同size_type 作为容器内置的类型别名能自动适配底层内存管理逻辑保证跨平台一致性。value_type 定义value_type 是 vector 模板的第一个参数 T即容器存储的元素类型如 vector int 中 value_type 就是 int。 设计意图 「模板通用性」vector 是模板类支持存储任意类型int、std::string、自定义类等。用 value_type 作为参数类型能让 resize 接口适配所有可能的元素类型无需为每种类型单独定义接口。 「类型安全」若直接用 int 作为参数类型当容器存储非 int 类型如 double、自定义结构体时会引发类型不匹配或隐式转换错误。而 value_type 严格匹配容器的元素类型从源头避免了这类风险。在这里插入图片描述在图中T 是模板类型参数对应标准库 vector 的 value_type代表容器要存储的元素类型比如 int、std::string 或自定义类。T()值初始化与匿名对象T() 是 C 的值初始化语法作用是生成一个匿名临时对象若 T 是自定义类且有默认构造函数T() 会直接调用其默认构造函数没有默认构造会报错生成该类的匿名对象若 T 是内置类型如 int、doubleC 标准规定 T() 执行零初始化例如 int() 等价于值为 0 的匿名 intdouble() 等价于 0.0指针初始化为空指针。可以认为C中内置类型也有默认构造和析构析构不做事情代码语言javascriptAI代码解释//C语言部分的定义 int i 0; //C98后还可以这样定义 int j int(); int j int(1); //C11后还可用花括号初始化 int y {}; int t {1}; int z{ 2 };这个匿名对象的生命周期极短仅用于初始化函数的缺省参数。所以说C搞得匿名对象非常重要非常好用T val T()缺省参数的初始化 这里的 T val T() 是函数的缺省参数定义—— 当调用 resize 时如果省略第二个参数编译器会用 T() 生成的匿名对象拷贝初始化 val如果传入自定义值如 resize(10, 5)则 val 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