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<stack> 运算符

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operator!=

测试运算符左侧的堆栈对象是否不等于右侧的堆栈对象。

bool operator!=(const stack <Type, Container>& left, const stack <Type, Container>& right,);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果堆栈或堆栈不相等，则为 true；否则为 false。

备注

堆栈对象之间的比较基于其元素的成对比较。 如果两个堆栈具有的元素数目相等且对应元素具有相同的值，则两个列表相等。 否则，它们不相等。

示例

// stack_op_me.cpp
// compile with: /EHsc
#include <stack>
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with vector base containers
   stack <int, vector<int> > s1, s2, s3;

   // The following would have cause an error because stacks with
   // different base containers are not equality comparable
   // stack <int, list<int> >  s3;

   s1.push( 1 );
   s2.push( 2 );
   s3.push( 1 );

   if ( s1 != s2 )
      cout << "The stacks s1 and s2 are not equal." << endl;
   else
      cout << "The stacks s1 and s2 are equal." << endl;

   if ( s1 != s3 )
      cout << "The stacks s1 and s3 are not equal." << endl;
   else
      cout << "The stacks s1 and s3 are equal." << endl;
}

The stacks s1 and s2 are not equal.
The stacks s1 and s3 are equal.

operator<

测试运算符左侧的堆栈对象是否小于右侧的堆栈对象。

bool operator<(const stack <Type, Container>& left, const stack <Type, Container>& right);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果运算符左侧的堆栈小于但不等于运算符右侧的堆栈，则为 true，否则为 false。

注解

堆栈对象之间的比较基于其元素的成对比较。 两个堆栈之间的小于关系基于首对不相等元素之间的比较。

示例

// stack_op_lt.cpp
// compile with: /EHsc
#include <stack>
#include <list>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with list base container
   stack <int, list<int> > s1, s2, s3;

   s1.push( 2 );
   s1.push( 4 );
   s1.push( 6 );
   s1.push( 8 );
   s2.push( 5 );
   s2.push( 10 );
   s3.push( 2 );
   s3.push( 4 );
   s3.push( 6 );
   s3.push( 8 );

   if ( s1 >= s2 )
      cout << "The stack s1 is greater than or equal to "
           << "the stack s2." << endl;
   else
      cout << "The stack s1 is less than "
           << "the stack s2." << endl;

   if ( s1>= s3 )
      cout << "The stack s1 is greater than or equal to "
           << "the stack s3." << endl;
   else
      cout << "The stack s1 is less than "
           << "the stack s3." << endl;

   // to print out the stack s1 ( by unstacking the elements):
   stack <int>::size_type i_size_s1 = s1.size( );
   cout << "The stack s1 from the top down is: ( ";
   unsigned int i;
   for ( i = 1 ; i <= i_size_s1 ; i++ )
   {
      cout << s1.top( ) << " ";
      s1.pop( );
   }
   cout << ")." << endl;
}

The stack s1 is less than the stack s2.
The stack s1 is greater than or equal to the stack s3.
The stack s1 from the top down is: ( 8 6 4 2 ).

operator<=

测试运算符左侧的堆栈对象是否小于或等于右侧的堆栈对象。

bool operator<=(const stack <Type, Container>& left, const stack <Type, Container>& right);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果运算符左侧的堆栈小于或等于运算符右侧的堆栈，则为 true，否则为 false。

注解

堆栈对象之间的比较基于其元素的成对比较。 两个堆叠对象之间的小于或等于关系基于首对不相等元素的比较。

示例

// stack_op_le.cpp
// compile with: /EHsc
#include <stack>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with default deque base container
   stack <int> s1, s2, s3;

   s1.push( 5 );
   s1.push( 10 );
   s2.push( 1 );
   s2.push( 2 );
   s3.push( 5 );
   s3.push( 10 );

   if ( s1 <= s2 )
      cout << "The stack s1 is less than or equal to "
           << "the stack s2." << endl;
   else
      cout << "The stack s1 is greater than "
           << "the stack s2." << endl;

   if ( s1 <= s3 )
      cout << "The stack s1 is less than or equal to "
           << "the stack s3." << endl;
   else
      cout << "The stack s1 is greater than "
           << "the stack s3." << endl;
}

The stack s1 is greater than the stack s2.
The stack s1 is less than or equal to the stack s3.

operator==

测试运算符左侧的堆栈对象是否等于右侧的堆栈对象。

bool operator==(const stack <Type, Container>& left, const stack <Type, Container>& right);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果堆栈或堆栈相等，则为 true；否则为 false。

注解

堆栈对象之间的比较基于其元素的成对比较。 如果两个堆栈具有的元素数目相等且对应元素具有相同的值，则两个列表相等。 否则，它们不相等。

示例

// stack_op_eq.cpp
// compile with: /EHsc
#include <stack>
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with vector base containers
   stack <int, vector<int> > s1, s2, s3;

   // The following would have cause an error because stacks with
   // different base containers are not equality comparable
   // stack <int, list<int> > s3;

   s1.push( 1 );
   s2.push( 2 );
   s3.push( 1 );

   if ( s1 == s2 )
      cout << "The stacks s1 and s2 are equal." << endl;
   else
      cout << "The stacks s1 and s2 are not equal." << endl;

   if ( s1 == s3 )
      cout << "The stacks s1 and s3 are equal." << endl;
   else
      cout << "The stacks s1 and s3 are not equal." << endl;
}

The stacks s1 and s2 are not equal.
The stacks s1 and s3 are equal.

operator>

测试运算符左侧的堆栈对象是否大于右侧的堆栈对象。

bool operator>(const stack <Type, Container>& left, const stack <Type, Container>& right);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果运算符左侧的堆栈大于但不等于运算符右侧的堆栈，则为 true，否则为 false。

备注

堆栈对象之间的比较基于其元素的成对比较。 两个堆栈对象之间的大于关系基于首对不相等元素的比较。

示例

// stack_op_gt.cpp
// compile with: /EHsc
#include <stack>
#include <list>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with list base container
   stack <int, list<int> > s1, s2, s3;

   s1.push( 1 );
   s1.push( 2 );
   s1.push( 3 );
   s2.push( 5 );
   s2.push( 10 );
   s3.push( 1 );
   s3.push( 2 );

   if ( s1 > s2 )
      cout << "The stack s1 is greater than "
           << "the stack s2." << endl;
   else
      cout << "The stack s1 is not greater than "
           << "the stack s2." << endl;

   if ( s1> s3 )
      cout << "The stack s1 is greater than "
           << "the stack s3." << endl;
   else
      cout << "The stack s1 is not greater than "
           << "the stack s3." << endl;
}

The stack s1 is not greater than the stack s2.
The stack s1 is greater than the stack s3.

operator>=

测试运算符左侧的堆栈对象是否大于或等于右侧的堆栈对象。

bool operator>=(const stack <Type, Container>& left, const stack <Type, Container>& right);

参数

left
一个 stack 类型的对象。

right
一个 stack 类型的对象。

返回值

如果运算符左侧的堆栈严格小于右侧的堆栈，则为 true；否则为 false。

备注

堆栈对象之间的比较基于其元素的成对比较。 两个堆栈对象之间大于或等于的关系基于首对不相等元素之间的比较。

示例

// stack_op_ge.cpp
// compile with: /EHsc
#include <stack>
#include <list>
#include <iostream>

int main( )
{
   using namespace std;

   // Declares stacks with list base container
   stack <int, list<int> > s1, s2, s3;

   s1.push( 1 );
   s1.push( 2 );
   s2.push( 5 );
   s2.push( 10 );
   s3.push( 1 );
   s3.push( 2 );

   if ( s1 >= s2 )
      cout << "The stack s1 is greater than or equal to "
           << "the stack s2." << endl;
   else
      cout << "The stack s1 is less than "
           << "the stack s2." << endl;

   if ( s1>= s3 )
      cout << "The stack s1 is greater than or equal to "
           << "the stack s3." << endl;
   else
      cout << "The stack s1 is less than "
           << "the stack s3." << endl;
}

The stack s1 is less than the stack s2.
The stack s1 is greater than or equal to the stack s3.