Immutable.js iterables offer the reduce() method, a powerful and often misunderstood functional operator on which map(), filter(), groupBy(), etc. are built. The concept is simple: reduce transforms your iterable into something else, that's all. The…
STL中list中push_back(对象)保存对象的内部实现 1. 在容器中,存放的是对象拷贝 #include<iostream> #include<list> using namespace std; class A{ int i; static int num; public: A():i(){ cout<<"A()" <<endl; num ++;} A(int ii):i(ii){ cout<<"A(in…