欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Vector容器删除元素

程序员文章站 2022-03-21 16:29:36
...

std::vector::erase

  (1)  
iterator erase( iterator pos );
(until C++11)
iterator erase( const_iterator pos );
(since C++11)
  (2)  
iterator erase( iterator first, iterator last );
(until C++11)
iterator erase( const_iterator first, const_iterator last );
(since C++11)
     

Removes specified elements from the container.

1) Removes the element at pos.
2) Removes the elements in the range [first; last).

Invalidates iterators and references at or after the point of the erase, including the end() iterator.

The iterator pos must be valid and dereferenceable. Thus the end() iterator (which is valid, but is not dereferencable) cannot be used as a value for pos.

The iterator first does not need to be dereferenceable if first==last: erasing an empty range is a no-op.

Parameters

pos - iterator to the element to remove
first, last - range of elements to remove
Type requirements
-T must meet the requirements of MoveAssignable.

Return value

Iterator following the last removed element. If the iterator pos refers to the last element, the end() iterator is returned.


注解:

1.删除指定迭代器位置的元素。

2.返回该元素的迭代器地址。

3.循环遍历时迭代器会自动指向下一个位置。举例如下:

    vector<int> vi;
    //vi.assign(100,1024);
    //vi.assign(100,INT_MAX);
    for(int i=1;i<=100;i++)
        vi.push_back(i);
    for(auto pt=vi.begin();pt!=vi.end();){
        if(*pt%2==0){
            auto del = vi.erase(pt);
            cout<<"del-"<<*del<<" ";
        }else{
            ++pt;
            cout<<*pt<<" ";
        }
    }

	
//输出
2 del-3 4 del-5 6 del-7 8 del-9 10 del-11 12 del-13 14 del-15 16 del-17 18 
del-19 20 del-21 22 del-23 24 del-25 26 del-27 28 del-29 30 del-31 32 del-33 34 
del-35 36 del-37 38 del-39 40 del-41 42 del-43 44 del-45 46 del-47 48 del-49 50 
del-51 52 del-53 54 del-55 56 del-57 58 del-59 60 del-61 62 del-63 64 del-65 66 
del-67 68 del-69 70 del-71 72 del-73 74 del-75 76 del-77 78 del-79 80 del-81 82 
del-83 84 del-85 86 del-87 88 del-89 90 del-91 92 del-93 94 del-95 96 del-97 98 del-99 100 del-100