fig20_23.cpp

来自「里面有很多关于编程的实用例子」· C++ 代码 · 共 82 行

// Fig. 20.23: fig20_23.cpp
// Standard Library adapter stack test program.
#include <iostream>
using std::cout;
using std::endl;

#include <stack> // stack adapter definition
#include <vector> // vector class-template definition
#include <list> // list class-template definition

// pushElements function-template prototype
template< typename T > void pushElements( T &stackRef );

// popElements function-template prototype 
template< typename T > void popElements( T &stackRef );

int main()
{
   // stack with default underlying deque
   std::stack< int > intDequeStack;   

   // stack with underlying vector
   std::stack< int, std::vector< int > > intVectorStack;

   // stack with underlying list
   std::stack< int, std::list< int > > intListStack;

   // push the values 0-9 onto each stack 
   cout << "Pushing onto intDequeStack: ";
   pushElements( intDequeStack );
   cout << "\nPushing onto intVectorStack: ";
   pushElements( intVectorStack );
   cout << "\nPushing onto intListStack: ";
   pushElements( intListStack );
   cout << endl << endl;

   // display and remove elements from each stack
   cout << "Popping from intDequeStack: ";
   popElements( intDequeStack );
   cout << "\nPopping from intVectorStack: ";
   popElements( intVectorStack );
   cout << "\nPopping from intListStack: ";
   popElements( intListStack );
   cout << endl;
   return 0;
} // end main

// push elements onto stack object to which stackRef refers
template< typename T > void pushElements( T &stackRef )
{
   for ( int i = 0; i < 10; i++ )
   {
      stackRef.push( i ); // push element onto stack
      cout << stackRef.top() << ' '; // view (and display) top element
   } // end for
} // end function pushElements

// pop elements from stack object to which stackRef refers
template< typename T > void popElements( T &stackRef )
{
   while ( !stackRef.empty() ) 
   {
      cout << stackRef.top() << ' '; // view (and display) top element
      stackRef.pop(); // remove top element
   } // end while
} // end function popElements

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