C++ STL emplace
C++ STL emplace
iterator container::emplace(const_iterator pos,args)
●在容器的iterator位置pos上安插新元素,以args为初值
●返回新元素的位置
●此操作会引起当前的iterator失效
●始自C++11
●提供者:vector、deque、list
#include <iostream> #include <vector> using namespace std; void test1() { vector<int> vector_1; vector<int>::const_iterator const_vec_iter; vector<int>::iterator vec_iter; for (int k = 1; k < 7; ++k) { vector_1.push_back(k); } for(const_vec_iter =vector_1.begin(); const_vec_iter !=vector_1.end();++const_vec_iter) { int index_value = *const_vec_iter; //cout << index_value << endl; if (index_value==3) { //vector_1.emplace(const_vec_iter, 10); vector_1.insert(const_vec_iter, 10); ///vector_1.emplace_back(10);
break;
} } for (vec_iter = vector_1.begin(); vec_iter != vector_1.end(); ++vec_iter) { int index_value = *vec_iter; cout << index_value << endl; } } int main() { test1(); system("pause"); return 0; }
输出结果
1 2 10 3 4 5 6
QQ 3087438119