66 lines
2.9 KiB
C++
66 lines
2.9 KiB
C++
|
// fig13_03.cpp
|
||
|
|
// Testing standard library vector class template
|
||
|
|
// element-manipulation functions.
|
||
|
|
#include <algorithm> // copy algorithm
|
||
|
|
#include <fmt/format.h> // C++20: This will be #include <format>
|
||
|
|
#include <iostream>
|
||
|
|
#include <ranges>
|
||
|
|
#include <iterator> // ostream_iterator iterator
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
std::vector values{1, 2, 3, 4, 5}; // class template argument deduction
|
||
|
|
std::vector<int> integers{values.cbegin(), values.cend()};
|
||
|
|
std::ostream_iterator<int> output{std::cout, " "};
|
||
|
|
|
||
|
|
std::cout << "integers contains: ";
|
||
|
|
std::copy(integers.cbegin(), integers.cend(), output);
|
||
|
|
|
||
|
|
std::cout << fmt::format("\nfront: {}\nback: {}\n\n",
|
||
|
|
integers.front(), integers.back());
|
||
|
|
|
||
|
|
integers[0] = 7; // set first element to 7
|
||
|
|
integers.at(2) = 10; // set element at position 2 to 10
|
||
|
|
|
||
|
|
// insert 22 as second element
|
||
|
|
integers.insert(integers.cbegin() + 1, 22);
|
||
|
|
|
||
|
|
std::cout << "Contents of vector integers after changes: ";
|
||
|
|
std::ranges::copy(integers, output);
|
||
|
|
|
||
|
|
integers.erase(integers.cbegin()); // erase first element
|
||
|
|
std::cout << "\n\nintegers after erasing first element: ";
|
||
|
|
std::ranges::copy(integers, output);
|
||
|
|
|
||
|
|
// erase remaining elements
|
||
|
|
integers.erase(integers.cbegin(), integers.cend());
|
||
|
|
std::cout << fmt::format("\nErased all elements: integers {} empty\n",
|
||
|
|
integers.empty() ? "is" : "is not");
|
||
|
|
|
||
|
|
// insert elements from the vector values
|
||
|
|
integers.insert(integers.cbegin(), values.cbegin(), values.cend());
|
||
|
|
std::cout << "\nContents of vector integers before clear: ";
|
||
|
|
std::ranges::copy(integers, output);
|
||
|
|
|
||
|
|
// empty integers; clear empties a collection
|
||
|
|
integers.clear();
|
||
|
|
std::cout << fmt::format("\nAfter clear, integers {} empty\n",
|
||
|
|
integers.empty() ? "is" : "is not");
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
* (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. *
|
||
|
|
**************************************************************************/
|