[TOC] # 拷贝 ~~~ vector<int> v; v.push_back(10); v.push_back(20); v.push_back(30); v.push_back(40); vector<int> v2; v2.resize(v.size()); copy(v.begin(), v.end(), v2.begin()); for_each(v2.begin(), v2.end(), [](int val){cout << val << " "; }); ~~~ # replace替换 * replace算法 将容器内指定范围的旧元素修改为新元素 * `replace_if`算法 将容器内指定范围满足条件的元素替换为新元素 ~~~ bool myfunc(int val) { return val > 30; } void test02() { vector<int> v; v.push_back(10); v.push_back(20); v.push_back(30); v.push_back(40); for_each(v.begin(), v.end(), [](int val){cout << val << " "; }); cout << endl; replace(v.begin(), v.end(), 20, 200); for_each(v.begin(), v.end(), [](int val){cout << val << " "; }); cout << endl; /* void _Replace_if(_FwdIt _First, _FwdIt _Last, _Pr _Pred, const _Ty& _Val) { // replace each satisfying _Pred with _Val for (; _First != _Last; ++_First) if (_Pred(*_First)) *_First = _Val; } */ replace_if(v.begin(), v.end(), myfunc, 300); for_each(v.begin(), v.end(), [](int val){cout << val << " "; }); cout << endl; } ~~~ # swap替换 ~~~ vector<int> v1; v1.push_back(1); v1.push_back(2); v1.push_back(3); vector<int> v2; v2.push_back(100); v2.push_back(200); v2.push_back(300); swap(v1, v2); for_each(v1.begin(), v1.end(), [](int val){cout << val << " "; }); cout << endl; for_each(v2.begin(), v2.end(), [](int val){cout << val << " "; }); cout << endl; ~~~