int main () { std::vector<int> myvector; for (int i=1; i<=5; i++) myvector.push_back(i); std::cout << "myvector contains:"; for (std::vector<int>::const_iterator it = myvector.begin() ; it != myvector.end(); ++i
std::vector<>是一个包装连续数组的容器类,因此指针作为迭代器是有意义的.在网上,在一些文献中你可以找到vector.begin()用作指针.使用指针的基本原理是开销更少,性能更高,特别是如果优化编译器检测到迭代并执行其操作(向量指令和内容).使用迭代器可能更难以使编译器进行优化....
// insert_iterator_op_incr.cpp// compile with: /EHsc#include<iterator>#include<vector>#include<iostream>intmain( ){usingnamespacestd;inti;vector<int> vec;for(i =1; i <5; ++i ) { vec.push_back ( i ); }vector<int>::iterator vIter;cout<<"The vector vec is:\n ( ";for( vIter...
Debug iterator checks also cause an iterator variable that's declared in a for loop to be out of scope when the for loop scope ends. c++ Copy // iterator_debugging_4.cpp // compile by using: /EHsc /MDd #include <vector> #include <iostream> int main() { std::vector<int> v ; ...
- This is a modal window. No compatible source was found for this media. stdintmain(){vector<int>mytutorial={2,4,6,8,10};vector<int>::iterator i1=mytutorial.begin();vector<int>::iterator i2=mytutorial.end();autoprevptr=prev(i2,5);cout<<"Result: "<<*prevptr<<" ";return0;...
// ostream_iterator_char_type.cpp// compile with: /EHsc#include<iterator>#include<vector>#include<iostream>intmain( ){usingnamespacestd;typedefostream_iterator<int>::char_type CHT1;typedefostream_iterator<int>::traits_type CHTR1;// ostream_iterator for stream cout// with new line delimiter:...
range-based for loop support (function) 此外,operator==和operator!=提供,或作为成员或非会员,按InputIterator... 注记 阿recursive_directory_iterator通常保存引用计数。指针%28以满足InputIterator%29指向一个实现对象,该对象包含: 容器%28,如std::vector%29directory_iterator斯,它构成递归堆栈。
__cpp_lib_conceptstemplate<typename_Iterator>struct__iterator_traits<_Iterator,__void_t<typename_Iterator::iterator_category,typename_Iterator::value_type,typename_Iterator::difference_type,typename_Iterator::pointer,typename_Iterator::reference>> ...
();std::vector<int>::iterator end = v.end();// use the sized_sentinel_for concept to verify that i can be subtracted from end in constant timestd::cout<<std::boolalpha <<std::sized_sentinel_for<decltype(end),decltype(i)> <<"\n";// outputs truestd::cout<< end - i;// ...
// insert_iterator_op_incr.cpp// compile with: /EHsc#include<iterator>#include<vector>#include<iostream>intmain( ){usingnamespacestd;inti;vector<int> vec;for(i =1; i <5; ++i ) { vec.push_back ( i ); }vector<int>::iterator vIter;cout<<"The vector vec is:\n ( ";for( vIter...