fig13_07.cpp

// fig13_07.cpp
// Standard library set class template.
#include <algorithm>
#include <fmt/format.h> // C++20: This will be #include <format>
#include <iostream>
#include <iterator> // ostream_iterator
#include <set>

int main() {
   std::set doubles{2.1, 4.2, 9.5, 2.1, 3.7}; // CTAD 

   std::ostream_iterator<double> output{std::cout, " "};
   std::cout << "doubles contains: ";
   std::ranges::copy(doubles, output);

   // insert 13.8 in doubles; insert returns pair in which
   // p.first represents location of 13.8 in doubles and  
   // p.second represents whether 13.8 was inserted         
   auto p{doubles.insert(13.8)}; // value not in set   
   std::cout << fmt::format("\n{} {} inserted\n", *(p.first),
      (p.second ? "was" : "was not"));
   std::cout << "doubles contains: ";
   std::ranges::copy(doubles, output);

   // insert 9.5 in doubles                          
   p = doubles.insert(9.5); // value already in set
   std::cout << fmt::format("\n{} {} inserted\n", *(p.first),
      (p.second ? "was" : "was not"));
   std::cout << "doubles contains: ";
   std::ranges::copy(doubles, output);
   std::cout << "\n";
}

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