// fig13_05.cpp
// Standard library deque class template.
#include <algorithm> // copy algorithm
#include <deque> // deque class-template definition
#include <iostream>
#include <iterator> // ostream_iterator

int main() {
   std::deque<double> values; // create deque of doubles
   std::ostream_iterator<double> output{std::cout, " "};

   // insert elements in values
   values.push_front(2.2);
   values.push_front(3.5);
   values.push_back(1.1);

   std::cout << "values contains: ";

   // use subscript operator to obtain elements of values
   for (size_t i{0}; i < values.size(); ++i) {
      std::cout << values[i] << ' ';
   }

   values.pop_front(); // remove first element
   std::cout << "\nAfter pop_front, values contains: ";
   std::ranges::copy(values, output);

   // use subscript operator to modify element at location 1
   values[1] = 5.4;
   std::cout << "\nAfter values[1] = 5.4, values contains: ";
   std::ranges::copy(values, output);
   std::cout << "\n";
}


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