[TOC] ~~~ #include<numeric>//算术生成算法的头文件 ~~~ # accumulate,计算容器元素累计总和 ~~~ vector<int> v; v.push_back(10); v.push_back(20); v.push_back(30); //第三个参数是在总和上再加上0 int ret=accumulate(v.begin(), v.end(), 0); cout << ret << endl; ~~~ ~~~ class Maker { public: Maker(int age) { this->age = age; } public: int age; }; struct MyPuls { int operator()(int val,Maker &m) { return val + m.age; } }; void test02() { vector<Maker> v; v.push_back(Maker(10)); v.push_back(Maker(20)); v.push_back(Maker(30)); int ret = accumulate(v.begin(), v.end(),0, MyPuls()); cout << ret << endl; } ~~~ # fill,向容器中添加元素 ~~~ void test03() { vector<int> v; //要开辟空间 v.resize(10); fill(v.begin(), v.end(), 100); for_each(v.begin(), v.end(), [](int val){cout << val << " "; }); } ~~~