Question 1

A tuple's ________ copies a tuple's elements into a new tuple of the same type.
A) copy constructor
B) move assignment
C) move constructor
D) default constructor

Accepted Answer

The copy constructor is used to create a new object as a copy of an existing object, which applies to tuples as well. It copies a tuple's elements into a new tuple of the same type.

Question 2

The ________ operator is particularly useful when working with complex template types for which it's often difficult to provide, or even determine, the proper type declaration. Rather than trying to write a complex type declaration, for example, that represents the return type of a function, you can place in the parentheses of this operator an expression that returns the complex type and let the compiler "figure it out."
A) infer_type
B) decltype
C) determine_type
D) static_assert

Accepted Answer

The decltype operator is particularly useful when working with complex template types for which it's difficult to provide, or even determine, the proper type declaration. It allows the programmer to extract the type of an expression at compile-time. This is helpful in situations where the type of an expression might be unknown or too cumbersome to specify explicitly.

Question 3

A tuple's ________ moves a tuple's elements into a new tuple of the same type.
A) copy constructor
B) move assignment
C) move constructor
D) default constructor

Accepted Answer

A move constructor moves a tuple's elements into a new tuple of the same type, allowing for efficient transfer of resources from one object to another without copying.

Question 4

Operator ________ enables the compiler to determine an expression's type at compile time.
A) static_assert
B) assert
C) decltype
D) typedef

Accepted Answer

The "decltype" operator enables the compiler to determine an expression's type at compile time.

Question 5

In C++11, in a class called Employee that has explicitly defined constructors, you can specify that the default constructor should be generated with the declaration ________.
A) Employee() = decltype;
B) Employee() = explicit;
C) Employee() = default;
D) Employee() = generate:

Accepted Answer

In C++11, to specify that the default constructor should be generated, we use the "= default" syntax after the constructor declaration in the class. Therefore, the correct choice is C: Employee() = default;

Question 6

In general, move constructors and move assignment operators should not throw exceptions because they're simply moving resources, not allocating new ones. For this reason, both the move constructor and move assignment operator are declared ________ in their prototypes and definitions.
A) const
B) nothrow
C) noexcept
D) noerror

Accepted Answer

The keyword "noexcept" is used to declare that a function will not throw any exceptions. In the case of move constructors and move assignment operators, this is important because they should not throw exceptions while moving resources.

Question 7

An rvalue reference is declared as ________ (where T is the type of the object being referenced. to distinguish it from a normal reference ________ (called an lvalue reference).
A) &&T, &T
B) T&, T&&
C) T*, T->
D) T&&, T&

Accepted Answer

An rvalue reference is declared as T&& to distinguish it from a normal reference (lvalue reference) which is declared as T&. Option A is incorrect as it has the && after T, which is invalid syntax. Option B is the syntax for a normal reference. Option C is the syntax for a pointer.

Question 8

Tuples that contain the same number of members ________.
A) cannot be compared to one another
B) can be compared to one another using only equality operators
C) can be compared to one another using only relational operators
D) can be compared to one another using the relational and equality operators

Accepted Answer

Tuples that contain the same number of members can be compared to one another using both relational and equality operators. For example, you can compare two tuples using '>' and '<=' operators or '==' and '!=' operators.

Question 9

An rvalue reference is used to implement move semantics-instead of being ________, the object's state (i.e., its content) is ________, leaving the original in a state that can be properly destructed.
A) copied, moved
B) moved, copied
C) assigned, initialized
D) initialized, assigned

Accepted Answer

An rvalue reference is used to implement move semantics by moving the object's state instead of copying it, which leaves the original object in a valid state that allows it to be destructed without issues.

Question 10

Prior to C++11 the following code created a temporary string object and passed it to push_back, which then copied it into the vector: vector<string> myVector;
MyVector.push_back("message");
As of C++11, member function push_back is now overloaded with a version that takes a(n) ________. This allows the preceding call to push_back to take the storage allocated for the temporary string and reuse it directly for the new element in the vector. The temporary string will be destroyed when the function returns, so there's no need for it to keep its content.
A) const pointer
B) rvalue reference
C) rvalue pointer
D) const reference

Accepted Answer

As of C++11, push_back is overloaded with a version that takes an rvalue reference as its argument. This is the best choice in this scenario because an rvalue reference can bind to a temporary string object, allowing the storage allocated for the temporary string to be reused directly for the new element in the vector. This is more efficient than creating a new string object and copying the content of the temporary string into it.

Question 11

A common example of a variadic template is the C++11's new tuple class (from header <tuple>), which is a generalization of class template ________.
A) triple
B) quad
C) pair
D) singleton

Accepted Answer

The tuple class template in C++11 is a generalization of the pair class template, which can hold two elements of possibly different types. The tuple class template, on the other hand, can hold multiple elements of possibly different types, with a maximum size of 10 by default.

Question 12

A tuple's ________ uses the assignment operator (=) to copy the elements of the tuple in the right operand into a tuple of the same type in the left operand. The element types stored in the constructor argument must be copy assignable.
A) move assignment
B) copy constructor
C) move constructor
D) copy assignment

Accepted Answer

The described operation is that of copy assignment, where the elements of one tuple are copied into another tuple of the same type using the assignment operator. The other choices (move assignment, copy constructor, move constructor) either do not involve copying elements between tuples or are not relevant to the scenario described.

Question 13

The ________ allows you to test constant integral expressions at compile time rather than runtime.
A) static_assert declaration
B) assert macro
C) static declaration
D) assert declaration

Accepted Answer

The answer of The ________ allows you to test constant...

Question 14

A ________ template accepts any number of arguments, which can greatly simplify template programming.
A) variable
B) varargs
C) var_arguments
D) variadic

Accepted Answer

A variadic template is a template that accepts any number of arguments. This can be useful for simplifying code that needs to work with a variable number of inputs, such as a function that needs to accept a variable number of arguments.

Question 15

If the initializer for a const variable is a function call, then the initialization occurs at ________.
A) compile time
B) load time
C) preprocessor time
D) run time

Accepted Answer

The answer of If the initializer for a const variable...

Question 16

Which of the following statements is true when a class contains both a copy constructor and a move constructor.
A) The compiler prefers to use the copy constructor.
B) The compiler prefers the move constructor.
C) The programmer explicitly specifies which to use in each case.
D) The compiler decides which one to use based on the context.

Accepted Answer

The compiler will decide which constructor to use based on the context. If the object being constructed can be moved (for example, if it is a temporary object), the compiler will prefer to use the move constructor. Otherwise, it will use the copy constructor. However, it is important to note that the programmer can also explicitly specify which constructor to use in each case.

Question 17

Which of the following statements is true?
A) When working with many of the C++ Standard Library containers, you can use the new member functions emplace, emplace_front, emplace_back, emplace_after and emplace_hint to insert objects into containers.
B) The emplace member functions insert objects into contains without invoking any copy or move operations.
C) The emplace member functions actually contruct new objects in place in the new container elements.
D) All of the above.

Accepted Answer

All of the statements are true. The emplace member functions are a new addition to the C++ Standard Library containers and allow the construction of objects directly in the container without the need for a separate copy or move operation. This is often more efficient and can also be used with objects that cannot be copied or moved. The various emplace functions correspond to where in the container the new object should be inserted.

Question 18

A tuple is a fixed-size collection of values that can be of ________.
A) any integral type
B) any character type
C) any string type
D) any type

Accepted Answer

Tuples can contain values of any type, including integers, floats, strings, characters, and even other tuples.

Question 19

Which of the following statements creates a tuple containing two strings, an int and a double?

A) tuple<string, string, int, double> hammerInventory{"12345", "Hammer", 32, 9.95};
B) auto hammerInventory{make_tuple(string("12345"), string("Hammer"), 32, 9.95)};
C) tuple hammerInventory{"12345", "Hammer", 32, 9.95};
D) Both A) and (b).

Accepted Answer

Both A and B are correct. A explicitly defines a tuple with the specified types, while B uses `make_tuple` with `auto` for type deduction, both achieving the creation of a tuple containing two strings, an int, and a double.

Question 20

A tuple's ________ creates a tuple in which each member is value initialized-primitive type values are set to 0 or the equivalent of 0 and objects of class types are initialized with their default constructors.
A) copy constructor
B) move assignment
C) move constructor
D) default constructor

Accepted Answer

The default constructor creates a tuple in which value initialized-primitive type values are set to 0 or the equivalent of 0 and objects of class types are initialized with their default constructors.

Quiz 24: C++11 Additional Features

A tuple's ________ copies a tuple's elements into a new tuple of the same type.

A tuple's ________ moves a tuple's elements into a new tuple of the same type.

Operator ________ enables the compiler to determine an expression's type at compile time.

In C++11, in a class called Employee that has explicitly defined constructors, you can specify that the default constructor should be generated with the declaration ________.

In general, move constructors and move assignment operators should not throw exceptions because they're simply moving resources, not allocating new ones. For this reason, both the move constructor and move assignment operator are declared ________ in their prototypes and definitions.

An rvalue reference is declared as (where T is the type of the object being referenced. to distinguish it from a normal reference (called an lvalue reference) .

Tuples that contain the same number of members ________.

An rvalue reference is used to implement move semantics-instead of being , the object's state (i.e., its content) is , leaving the original in a state that can be properly destructed.

A common example of a variadic template is the C++11's new tuple class (from header <tuple>) , which is a generalization of class template ________.

A tuple's ________ uses the assignment operator (=) to copy the elements of the tuple in the right operand into a tuple of the same type in the left operand. The element types stored in the constructor argument must be copy assignable.

The ________ allows you to test constant integral expressions at compile time rather than runtime.

A ________ template accepts any number of arguments, which can greatly simplify template programming.

If the initializer for a const variable is a function call, then the initialization occurs at ________.

Which of the following statements is true when a class contains both a copy constructor and a move constructor.

Which of the following statements is true?

A tuple is a fixed-size collection of values that can be of ________.

Which of the following statements creates a tuple containing two strings, an int and a double?

A tuple's ________ creates a tuple in which each member is value initialized-primitive type values are set to 0 or the equivalent of 0 and objects of class types are initialized with their default constructors.

Quiz 24: C++11 Additional Features

A tuple's ________ copies a tuple's elements into a new tuple of the same type.

A tuple's ________ moves a tuple's elements into a new tuple of the same type.

Operator ________ enables the compiler to determine an expression's type at compile time.

In C++11, in a class called Employee that has explicitly defined constructors, you can specify that the default constructor should be generated with the declaration ________.

In general, move constructors and move assignment operators should not throw exceptions because they're simply moving resources, not allocating new ones. For this reason, both the move constructor and move assignment operator are declared ________ in their prototypes and definitions.

An rvalue reference is declared as ________ (where T is the type of the object being referenced. to distinguish it from a normal reference ________ (called an lvalue reference) .

Tuples that contain the same number of members ________.

An rvalue reference is used to implement move semantics-instead of being ________, the object's state (i.e., its content) is ________, leaving the original in a state that can be properly destructed.

A common example of a variadic template is the C++11's new tuple class (from header <tuple>) , which is a generalization of class template ________.

A tuple's ________ uses the assignment operator (=) to copy the elements of the tuple in the right operand into a tuple of the same type in the left operand. The element types stored in the constructor argument must be copy assignable.

The ________ allows you to test constant integral expressions at compile time rather than runtime.

A ________ template accepts any number of arguments, which can greatly simplify template programming.

If the initializer for a const variable is a function call, then the initialization occurs at ________.

Which of the following statements is true when a class contains both a copy constructor and a move constructor.

Which of the following statements is true?

A tuple is a fixed-size collection of values that can be of ________.

Which of the following statements creates a tuple containing two strings, an int and a double?

A tuple's ________ creates a tuple in which each member is value initialized-primitive type values are set to 0 or the equivalent of 0 and objects of class types are initialized with their default constructors.

An rvalue reference is declared as (where T is the type of the object being referenced. to distinguish it from a normal reference (called an lvalue reference) .

An rvalue reference is used to implement move semantics-instead of being , the object's state (i.e., its content) is , leaving the original in a state that can be properly destructed.