fig14_10.cpp

// fig14_10.cpp
// Algorithms inplace_merge, unique_copy and reverse_copy.
#include <algorithm>
#include <array> 
#include <iostream>
#include <iterator> 
#include <vector> 

int main() {
   std::array a1{1, 3, 5, 7, 9, 1, 3, 5, 7, 9};
   std::ostream_iterator<int> output{std::cout, " "};

   std::cout << "array a1 contains: ";
   std::ranges::copy(a1, output);

   // merge first half of a1 with second half of a1 such that
   // a1 contains sorted set of elements after merge         
   std::ranges::inplace_merge(a1, a1.begin() + 5);
   std::cout << "\nAfter inplace_merge, a1 contains: ";
   std::ranges::copy(a1, output);

   // copy only unique elements of a1 into results1                 
   std::vector<int> results1{};
   std::ranges::unique_copy(a1, std::back_inserter(results1));
   std::cout << "\nAfter unique_copy, results1 contains: ";
   std::ranges::copy(results1, output);

   // copy elements of a1 into results2 in reverse order             
   std::vector<int> results2{};
   std::ranges::reverse_copy(a1, std::back_inserter(results2));
   std::cout << "\nAfter reverse_copy, results2 contains: ";
   std::ranges::copy(results2, output);
   std::cout << "\n";
}


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