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CodeBlocksPortable/Borland/BCC55/Examples/StdLib/alg5.cpp

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#include "stlexam.h"
#pragma hdrstop
/**************************************************************************
*
* alg5.cpp - Example programs for STL generic algorithms those producing
* scalar values. Section 12.6
*
***************************************************************************
*
* (c) Copyright 1994, 1998 Rogue Wave Software, Inc.
* ALL RIGHTS RESERVED
*
* The software and information contained herein are proprietary to, and
* comprise valuable trade secrets of, Rogue Wave Software, Inc., which
* intends to preserve as trade secrets such software and information.
* This software is furnished pursuant to a written license agreement and
* may be used, copied, transmitted, and stored only in accordance with
* the terms of such license and with the inclusion of the above copyright
* notice. This software and information or any other copies thereof may
* not be provided or otherwise made available to any other person.
*
* Notwithstanding any other lease or license that may pertain to, or
* accompany the delivery of, this computer software and information, the
* rights of the Government regarding its use, reproduction and disclosure
* are as set forth in Section 52.227-19 of the FARS Computer
* Software-Restricted Rights clause.
*
* Use, duplication, or disclosure by the Government is subject to
* restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
* Technical Data and Computer Software clause at DFARS 252.227-7013.
* Contractor/Manufacturer is Rogue Wave Software, Inc.,
* P.O. Box 2328, Corvallis, Oregon 97339.
*
* This computer software and information is distributed with "restricted
* rights." Use, duplication or disclosure is subject to restrictions as
* set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
* Computer Software-Restricted Rights (April 1985)." If the Clause at
* 18-52.227-74 "Rights in Data General" is specified in the contract,
* then the "Alternate III" clause applies.
*
**************************************************************************/
#include <vector>
#include <list>
#include <algorithm>
#include <numeric>
#include <string.h>
#include <string>
#ifdef _RW_STD_IOSTREAM
#include <iostream>
#else
#include <iostream.h>
#endif
#ifndef _RWSTD_NO_NAMESPACE
using namespace std;
#endif
//
// Forward declarations.
//
bool isVowel (char);
void count_example();
void accumulate_example();
template<class T>
list<T,allocator<void> > & listadd(list<T,allocator<void> > & base, T & newValue);
void inner_product_example();
void equal_example();
bool isVowel (char c)
{
switch (c)
{
case 'a': case 'A':
case 'e': case 'E':
case 'i': case 'I':
case 'o': case 'O':
case 'u': case 'U':
return true;
}
return false;
}
//
// Illustrate the use of the count function.
//
void count_example ()
{
int ecount = 0;
int vowelCount = 0;
char * text = "Now is the time to begin";
count (text, text + strlen(text), 'e', ecount);
count_if (text, text + strlen(text), isVowel, vowelCount);
cout << "There are " << ecount << " letter e's " << endl << "and "
<< vowelCount << " vowels in the text:" << text << endl;
}
//
// Add n to 1 to list.
//
list<int,allocator<int> >& intReplicate (list<int,allocator<int> >& nums, int n)
{
while (n) nums.push_back(n--);
return nums;
}
//
// Illustrate the use of the accumulate function.
//
void accumulate_example ()
{
int numbers[] = { 1, 2, 3, 4, 5 };
int sum = accumulate(numbers, numbers+5, 0);
int product = accumulate(numbers, numbers+5, 1, multiplies<int>());
cout << "The sum of the first five numbers is " << sum << endl;
cout << "The product of the first five numbers is " << product << endl;
//
// Example with different types for init.
//
list<int,allocator<int> > nums;
nums = accumulate(numbers, numbers+5, nums, intReplicate);
copy (nums.begin(), nums.end(), ostream_iterator<int,char,char_traits<char> >(cout, " "));
cout << endl;
}
//
// Illustrate the use of the inner_product function.
//
void inner_product_example ()
{
int a[] = { 4, 3, -2 };
int b[] = { 7, 3, 2 };
//
// Example 1, simple inner product.
//
int in1 = inner_product(a, a+3, b, 0);
cout << "Inner product is " << in1 << endl;
//
// Example 2, using different operations.
//
bool anyequal = inner_product(a, a+3, b, true, logical_or<bool>(),
equal_to<int>());
cout << "any equal? " << anyequal << endl;
}
//
// Illustrate the use of the equal function.
//
void equal_example ()
{
int a[] = { 4, 5, 3 };
int b[] = { 4, 3, 3 };
int c[] = { 4, 5, 3 };
cout << "a = b is:" << equal(a, a+3, b) << endl;
cout << "a = c is:" << equal(a, a+3, c) << endl;
cout << "a pair-wise-greater_equal b is"
<< equal(a, a+3, b, greater_equal<int>()) << endl;
}
//
// Illustrate the use of the lexical_comparison function.
//
void lexical_comparison_example ()
{
char * wordOne = "everything";
char * wordTwo = "everybody";
cout << "compare everybody to everything "
<< lexicographical_compare(wordTwo, wordTwo+strlen(wordTwo), wordOne,
wordOne+strlen(wordOne))
<< endl;
int a[] = { 3, 4, 5, 2 };
int b[] = { 3, 4, 5 };
int c[] = { 3, 5 };
cout << "compare a to b: " << lexicographical_compare(a,a+4,b,b+3) << endl;
cout << "compare a to c: " << lexicographical_compare(a,a+4,c,c+2) << endl;
}
int main ()
{
cout << "STL generic algorithms -- algorithms that produce scalar results" << endl;
count_example();
accumulate_example();
inner_product_example();
equal_example();
lexical_comparison_example();
cout << "End of scalar algorithms test" << endl;
return 0;
}