INFO: max_size Function

MORE INFORMATION

Required Header

   <set>
				

Prototype

   template<class _K, class _Pr, class _A>
   class set {
   public:
   // Function 1:

      size_type max_size() const;

   }
				

NOTE: The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.

Description

The max_size function is used to determine the maximum number of elements the controlled sequence can contain.

Sample Code

////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: -GX
// 
// SetMax_size.cpp:
//      Illustrates how to use the max_size function to determine how
//      many elements the controlled sequence can contain.
// 
// Functions:
// 
//    max_size     Returns the maximum number of elements the controlled
//                 sequence can contain.
// 
// Written by Derek Jamison
// of Microsoft Technical Support,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
////////////////////////////////////////////////////////////////////// 

#pragma warning(disable:4786)

#include <set>
#include <iostream>
#include <assert.h>
using namespace std;

#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
   #endif

typedef set<int,less<int>,allocator<int> > SET_INT;

void main() {

  SET_INT s1;

  cout << "s1.max_size() returned ";
  cout << s1.max_size() << endl;  // 1073741823 [value may vary]
  for (int x=0;(x<1000 && x<s1.max_size());x++)

   assert(s1.insert(x).second);

  cout << "s1.size() returned ";
  cout << s1.size() << endl; // 1000
}
				

Program Output

s1.max_size() returned 1073741823
s1.size() returned 1000