vec.empty()) { // 获取并打印最后一个元素 int lastElement = vec.back(); std::cout << "The last element is: " << lastElement << std::endl; } else { std::cout << "The vector is empty." << std::
#include<iostream>#include<vector>intmain(){ std::vector<int> v = {1,2,3,4,5};// 添加元素v.push_back(6);// 访问元素std::cout <<"Element at index 2: "<< v[2] << std::endl; std::cout <<"First element: "<< v.front() << std::endl; std::cout <<"Last element: "...
iterator erase(const_iterator _Where) { // erase element at where if (_VICONT(_Where) != &this->_Get_data() || _VIPTR(_Where) < this->_Myfirst() || this->_Mylast() <= _VIPTR(_Where)) _DEBUG_ERROR("vector erase iterator outside range"); _Move(_VIPTR(_Where) + 1, t...
unordered_set的emtpy()实现也是判断size()==0。而size()返回的是内部维护的私有变量M_element_count。
$$ save pointer to first element (current element) r? $t0=${$arg1}._Myfirst $$ save pointer to last element r? $t1=${$arg1}._Mylast $$ save first forever r? $t2=@$t0 .while (@$t0 != @$t1) { .if (${/d:$arg2} == 0) { ...
constructs an element in-place at the end (public member function) append_range (C++23) adds a range of elements to the end (public member function) pop_back removes the last element (public member function) resize changes the number of elements stored ...
[i];std::cout<<"\n";// Iterator that store the position of last elementstd::vector<int>::iterator pend;// std :: remove function callpend=std::remove(vec.begin(),vec.end(),20);// Print the vector after std :: removestd::cout<<"Range contains:";for(std::vector<int>::...
Iterator following the last removed element. If pos refers to the last element, then the end() ...
constructs an element in-place at the end (public member function) append_range (C++23) adds a range of elements to the end (public member function) pop_back removes the last element (public member function) resize changes the number of elements stored ...
iterator erase(const_iterator _Where) { // erase element at where if (_VICONT(_Where) != &this->_Get_data() || _VIPTR(_Where) < this->_Myfirst() || this->_Mylast() <= _VIPTR(_Where)) ... _Destroy(this->_Mylast() - 1, this->_Mylast()); ... } 1. 先看现象...