Questions tagged «chaining»

4
方法链中的C ++执行顺序
该程序的输出: #include <iostream> class c1 { public: c1& meth1(int* ar) { std::cout << "method 1" << std::endl; *ar = 1; return *this; } void meth2(int ar) { std::cout << "method 2:"<< ar << std::endl; } }; int main() { c1 c; int nu = 0; c.meth1(&nu).meth2(nu); } 是: method 1 …

3
Javascript继承:调用超级构造函数还是使用原型链?
最近,我读到有关MDC中JavaScript调用用法的信息 https://developer.mozilla.org/zh-CN/JavaScript/Reference/Global_Objects/Function/call 下面显示的示例的一个链接,我还是不明白。 他们为什么在这里使用继承 Prod_dept.prototype = new Product(); 这有必要吗?因为在这里有对超级构造函数的调用 Prod_dept() 反正像这样 Product.call 这只是常见的行为吗?什么时候使用调用超级构造函数或使用原型链更好? function Product(name, value){ this.name = name; if(value >= 1000) this.value = 999; else this.value = value; } function Prod_dept(name, value, dept){ this.dept = dept; Product.call(this, name, value); } Prod_dept.prototype = new Product(); // since 5 is less …
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