stack::empty

测试,如果堆栈为空。

bool empty( ) const;

返回值

true,如果堆栈为空;false,则堆栈非空。

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

页眉: <堆栈>

命名空间: std

请参见

参考

stack 类

stack::top and stack::empty

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