Let's assume that we start with the following variable declarations and initializations: std::string s = "perfect"; std::list a1{"Boo", "is", s, "today"}; const std::list a2{"Boo", "will", "always", "be", s}; std::map m1{{3, 4.5}, {0, -7.25}, {1, 9.75}}; Now assume that you wrote the following variable declarations and initializations using the auto specifier in place of a type. Assume that each is separate from the others (i.e., it's not an error that they all have the same variable name) and that any necessary C++ Standard Library headers have been included already. auto x = 2005; auto x = a1.begin(); auto x = a2.end(); auto x = a1.size(); auto x = m1[3]; auto& x = m1[3]; auto x = *(m1.begin()); auto x = std::accumulate( a1.begin(), a1.end(), std::string{}.size(), [](auto a, auto b) { return a + b.size(); }); For each of these, what type would be inferred by auto for the variable x that has been declared and initialized? Next, answer the following follow-up question: Suppose that a1 had been declared as a std::vector instead of as a std::list. Which of the following lines of code would you expect to be faster, on average, when using vectors than they would have been when using lists? Briefly, in a sentence or two, explain why. a1.push_back("!"); a1.insert(a1.begin(), "Little");

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter7: User-defined Simple Data Types, Namespaces, And The String Type

Section: Chapter Questions

Problem 1TF

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This is in C++

Let's assume that we start with the following variable declarations and initializations:

std::string s = "perfect"; std::list<std::string> a1{"Boo", "is", s, "today"}; const std::list<std::string> a2{"Boo", "will", "always", "be", s}; std::map<int, double> m1{{3, 4.5}, {0, -7.25}, {1, 9.75}};

Now assume that you wrote the following variable declarations and initializations using the auto specifier in place of a type. Assume that each is separate from the others (i.e., it's not an error that they all have the same variable name) and that any necessary C++ Standard Library headers have been included already.

auto x = 2005;
auto x = a1.begin();
auto x = a2.end();
auto x = a1.size();
auto x = m1[3];
auto& x = m1[3];
auto x = *(m1.begin());
auto x = std::accumulate(
a1.begin(), a1.end(), std::string{}.size(),
[](auto a, auto b) { return a + b.size(); });

For each of these, what type would be inferred by auto for the variable x that has been declared and initialized?

Next, answer the following follow-up question:

Suppose that a1 had been declared as a std::vector<std::string> instead of as a std::list<std::string>. Which of the following lines of code would you expect to be faster, on average, when using vectors than they would have been when using lists? Briefly, in a sentence or two, explain why.
- a1.push_back("!");
- a1.insert(a1.begin(), "Little");

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