stack::empty
;如果堆栈为空,测试。
bool empty( ) const;
返回值
true ;如果堆栈为空; false,如果堆栈非空。
示例
// stack_empty.cpp
// compile with: /EHsc
#include <stack>
#include <iostream>
int main( )
{
using namespace std;
// Declares stacks with default deque base container
stack <int> s1, s2;
s1.push( 1 );
if ( s1.empty( ) )
cout << "The stack s1 is empty." << endl;
else
cout << "The stack s1 is not empty." << endl;
if ( s2.empty( ) )
cout << "The stack s2 is empty." << endl;
else
cout << "The stack s2 is not empty." << endl;
}
要求
标头: <stack>
命名空间: std