inline const int iterator_to_index(MYARRAY &a, MYARRAY::iterator it) { return it - a.begin(); } // Example use main() { MYARRAY a; int index; a.push_back("one"); a.push_back("two"); a.push_back("three"); for (MYARRAY::iterator it = a.begin(); it != a.end(); ...
#include<vector>typedefstd::vector<char*> MYARRAY;// This does the trickinlineconstintiterator_to_index(MYARRAY &a, MYARRAY::iterator it){returnit - a.begin(); }// Example usemain() { MYARRAY a;intindex; a.push_back("one"); a.push_back("two"); a.push_back("three");for(MY...
如果需要进行遍历,尽量使用vector,然后通过index获取元素 一、几种遍历的效率对比 1. 方式1:unordered_set迭代器 void test01(){ uint seed=1; unordered_set<int> set_tmp; for(int i=0;i<60;i++){ set_tmp.insert(i); } clock_t startTime=clock(); for(int i=0;i<10000000;i++){ for(auto...
insert(index1, 0); // [10, 0, 20] vector<int> ::iterator index2 = find(a.begin(), a.end(), 20); a.erase(index2); // [10, 0] a.clear(); 索引与遍历 a.at(int index) 索引index位置(引用) a.front() 首元素的引用 a.back() 尾元素的引用 a.begin() 指向首元素的...
cout<<"删除第一个元素后:"<<endl;intindex1; vector<int>::iterator iter;//使用迭代器访问元素for(iter=vint.begin(),index1=0;iter!=vint.end();iter++,index1++) { cout<<"vint["<<index1<<"] ="<<*iter<<""; } cout<<endl;#pragmaendregion#pragmaregion 利用pop_back函数删除尾部元素/...
(),print);vector<int>::iterator location_index;location_index=find(data.begin(),data.end(),2);//数字2的下标cout<<(location_index-data.begin())<<endl;location_index=find_if(data.begin(),data.end(),bind2nd(greater<int>(),4));//第一个大于4的下标cout<<(location_index-data.begin()...
* Returns a read/write iterator that points one past the last * element in the %vector. Iteration is done in ordinary * element order. */iteratorend()_GLIBCXX_NOEXCEPT{returniterator(this->_M_impl._M_finish);}/** * Returns a read-only (constant) iterator that points one past ...
# 每个文档都是list中一个item,我们也可以使用其它iterator,比如通过generator来进行处理 In [106]: corpus = ["this artical is about scikit-learn vectorizor", ...: "do you like it", ...: "if you like it, please click favorite"]
iterator begin():返回向量头指针,指向第一个元素 iterator end():返回向量尾指针,指向向量最后一个元素的下一个位置 reverse_iterator rbegin():反向迭代器,指向最后一个元素 reverse_iterator rend():反向迭代器,指向第一个元素之前的位置 5.判断函数