A Functional Use for Lambdas

🔖 Background Information

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🎯 Problem Statement

The goal of this lab is to explore the C++ std::sort function with a variety of arguments. You will test out how built-in C++ functions, custom lambda functions, and custom structs affect the output.

✅ Acceptance Criteria

1. Create an array of ten integers that are initially in a scrambled order.
2. Run std::sort on the array with the following passed in as the third argument:
   • No third argument
   • The greater and less functions built into C++
   • A lambda comparing two integer arguments with cases for greater than and less than
   • A custom struct comparing two integer arguments with cases for greater than and less than
3. Answer the Thought-Provoking Questions.

📋 Dev Notes

• You might need to rescramble the integers after every test to make sure you are not skewing the output in any way.
• You do NOT need to turn in any code for this lab. I am only interested in the answers to the Thought-Provoking Questions.

🖥️ Example Output

You need to test std::sort for a variety of cases listed above. Note that you might need to rescramble the array or only test one sort at a time to ensure that the results of one trial do not skew the results of another.

Your driver program might include:

#include <array>
 
int main()
{
  std::array<int, 10> my_numbers{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
 
  std::sort(my_numbers.begin(), my_numbers.end());
  std::sort(my_numbers.begin(), my_numbers.end(), std::greater<int>());
  std::sort(my_numbers.begin(), my_numbers.end(), std::less<int>());
  std::sort(my_numbers.begin(), my_numbers.end(), [](int a, int b)
            { return a > b; });
  std::sort(my_numbers.begin(), my_numbers.end(), [](int a, int b)
            { return a < b; });
 
  struct
  {
    bool operator()(int a, int b) const { return a < b; }
  } custom_less;
 
  std::sort(my_numbers.begin(), my_numbers.end(), custom_less);
 
  struct
  {
    bool operator()(int a, int b) const { return a > b; }
  } custom_greater;
 
  std::sort(my_numbers.begin(), my_numbers.end(), custom_greater);
}

📝 Thought Provoking Questions

For each of the cases listed in the acceptance criteria, answer the following questions:

1. What does the expression return when you print it out to the console?
2. Does the expression change the original array?

💼 Add-Ons For the Portfolio

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🔗 Useful Links

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📘 Works Cited

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