deque::push_front
将元素添加到、向量、双端队列的开头。
void push_front(
const Type& _Val
);
void push_front(
Type&& _Val
);
参数
Parameter |
说明 |
_Val |
元素添加到、向量、双端队列的开头。 |
备注
如果引发了异常,、向量、双端队列保持不变,并且异常来重新引发。
示例
// deque_push_front.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
#include <string>
int main( )
{
using namespace std;
deque <int> c1;
c1.push_front( 1 );
if ( c1.size( ) != 0 )
cout << "First element: " << c1.front( ) << endl;
c1.push_front( 2 );
if ( c1.size( ) != 0 )
cout << "New first element: " << c1.front( ) << endl;
// move initialize a deque of strings
deque <string> c2;
string str("a");
c2.push_front( move( str ) );
cout << "Moved first element: " << c2.front( ) << endl;
}
要求
标头: <deque>
命名空间: std