stack::empty
測試,如果此堆疊是空的。
bool empty( ) const;
傳回值
true ,如果此堆疊是空的, false ,如果堆疊為非空白序列。
範例
// 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;
}
需求
標題: <stack>
命名空間: std