c-resources/CPlusPlus20ForProgrammers-m.../examples/ch13/fig13_07.cpp

48 lines
2.2 KiB
C++
Raw Normal View History

2024-04-09 06:45:18 +00:00
// 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";
}
/**************************************************************************
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/