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string search with custom comparison function
/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <string>
#include <iostream>
#include <algorithm>
using namespace std;
bool nocase_compare (char c1, char c2)
{
return toupper(c1) == toupper(c2);
}
int main()
{
string s1("This is a string");
string s2("STRING");
// compare case insensitive
if (s1.size() == s2.size() && // ensure same sizes
equal (s1.begin(),s1.end(), // first source string
s2.begin(), // second source string
nocase_compare)) { // comparison criterion
cout << "the strings are equal" << endl;
}
else {
cout << "the strings are not equal" << endl;
}
// search case insensitive
string::iterator pos;
pos = search (s1.begin(),s1.end(), // source string in which to search
s2.begin(),s2.end(), // substring to search
nocase_compare); // comparison criterion
if (pos == s1.end()) {
cout << "s2 is not a substring of s1" << endl;
}
else {
cout << """ << s2 << "\" is a substring of \""
<< s1 << "\" (at index " << pos - s1.begin() << ")"
<< endl;
}
}
/*
the strings are not equal
"STRING" is a substring of "This is a string" (at index 10)
*/
