Comparing Ranges with Different kinds of comparisons - C++ STL Algorithm

C++ examples for STL Algorithm:lexicographical_compare

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Description

Comparing Ranges with Different kinds of comparisons

Demo Code

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

template<typename C>
void printContainer(const C& c, char delim = ',', ostream& out = cout) {
   printRange(c.begin(), c.end(), delim, out);
}

template<typename Fwd>
void printRange(Fwd first, Fwd last, char delim = ',', ostream& out = cout) {
   out << "{";
   while (first != last) {
      out << *first;//w w  w.  j  a va  2 s  .  com
      if (++first != last)
         out << delim << ' ';
   }
   out << "}" << endl;
}

int main() {

   vector<string> vec1, vec2;

   vec1.push_back("A");
   vec1.push_back("B");
   vec1.push_back("C");

   vec2.push_back("a");
   vec2.push_back("b");
   vec2.push_back("c");

   if (equal(vec1.begin(), vec1.end(), vec2.begin())) {
      cout << "The two ranges are equal!" << endl;
   } else {
      cout << "The two ranges are NOT equal!" << endl;
   }

   string s1 = "abcde";
   string s2 = "abcdef";
   string s3 = "abc";

   cout << boolalpha  // Show bools as "true" or "false"
        << lexicographical_compare(s1.begin(), s1.end(), s1.begin(), s1.end()) << endl;
   cout << lexicographical_compare(s1.begin(), s1.end(), s2.begin(), s2.end()) << endl;
   cout << lexicographical_compare(s2.begin(), s2.end(), s1.begin(), s1.end()) << endl;
   cout << lexicographical_compare(s1.begin(), s1.end(), s3.begin(), s3.end()) << endl;
   cout << lexicographical_compare(s3.begin(), s3.end(), s1.begin(), s1.end()) << endl;

   pair<string::iterator, string::iterator> iters = mismatch(s1.begin(), s1.end(), s2.begin());

   cout << "first mismatch  = " << *(iters.first) << endl;
   cout << "second mismatch = " << *(iters.second) << endl;
}

Result


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