c-resources/CPlusPlus20ForProgrammers-m.../examples/ch14/fig14_11.cpp

76 lines
3.3 KiB
C++

// fig14_11.cpp
// Algorithms includes, set_difference, set_intersection,
// set_symmetric_difference and set_union.
#include <array>
#include <algorithm>
#include <fmt/format.h> // C++20: This will be #include <format>
#include <iostream>
#include <iterator>
#include <vector>
int main() {
std::array a1{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
std::array a2{4, 5, 6, 7, 8};
std::array a3{4, 5, 6, 11, 15};
std::ostream_iterator<int> output{std::cout, " "};
std::cout << "a1 contains: ";
std::ranges::copy(a1, output); // display array a1
std::cout << "\na2 contains: ";
std::ranges::copy(a2, output); // display array a2
std::cout << "\na3 contains: ";
std::ranges::copy(a3, output); // display array a3
// determine whether a2 is completely contained in a1
std::cout << fmt::format("\n\na1 {} a2",
std::ranges::includes(a1, a2) ? "includes" : "does not include");
// determine whether a3 is completely contained in a1
std::cout << fmt::format("\n\na1 {} a3",
std::ranges::includes(a1, a3) ? "includes" : "does not include");
// determine elements of a1 not in a2
std::vector<int> difference{};
std::ranges::set_difference(a1, a2, std::back_inserter(difference));
std::cout << "\n\nset_difference of a1 and a2 is: ";
std::ranges::copy(difference, output);
// determine elements in both a1 and a2
std::vector<int> intersection{};
std::ranges::set_intersection(a1, a2,
std::back_inserter(intersection));
std::cout << "\n\nset_intersection of a1 and a2 is: ";
std::ranges::copy(intersection, output);
// determine elements of a1 that are not in a3 and
// elements of a3 that are not in a1
std::vector<int> symmetricDifference{};
std::ranges::set_symmetric_difference(a1, a3,
std::back_inserter(symmetricDifference));
std::cout << "\n\nset_symmetric_difference of a1 and a3 is: ";
std::ranges::copy(symmetricDifference, output);
// determine elements that are in either or both sets
std::vector<int> unionSet{};
std::ranges::set_union(a1, a3, std::back_inserter(unionSet));
std::cout << "\n\nset_union of a1 and a3 is: ";
std::ranges::copy(unionSet, output);
std::cout << "\n";
}
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