COMS 250: Exam 3: Exceptions and Templates

These are used to signal errors or unexpected events that occur while a program is running

Exceptions

The ________ starts with the keyword “try”, and is followed by a block of code executing any statements that might cause an exception to be thrown.

try block

When an error occurs, an exception is _______.

thrown

An exception thrown from outside a try block _______.

will cause the program to abort excecution

If an exception is thrown by a member function of a class object, then the class ________ is called.

catcher/ handler

In a function template, the programmer substitutes _______ for _______.

parameters, data types

A(n) __________ is used in a function template to specify a generic data type

type parameter

The beginning of a function template is marked by a _________.

template prefix

class templates allow you to create one general version of a class without having to _______.

duplicate code to handle multiple data types

In the following statement:

template <class T>

what does the word “class” indicate?

“class” is a keyword that is used to precede the type parameter T.

A(n) _________ is a value or an object that signals an error.

exception

To handle an exception that has been thrown, a program must have a(n) ________.

try/ catch construct

The try block is immediately followed by one or more _______.

catch blocks

Catch blocks serve as ______.

exception handlers

This is a “generic” function that can work with any data type

function template

All type parameters defined in a function template must appear at least once in the ______.

function's parameter list

A function template’s prefix contains _______ enclosed in angled brackets

one or more generic data types

An actual instance of the function is created in memory when the complier encounters ______.

a call to the template function

A function template prefix is placed before the function header. A class template prefix is placed ________.

before the class declaration

The most important data structure in the STL are ______ and _______.

containers, iterators

T/F: The try/ catch/ throw construct is able to handle only one type of exception in a try block

False, it can handle multiple types.

T/F: There is no difference between declaring an object of an ordinary class and an object of a template class

False, template classes allow for parameterized types and can be instantiated with different data types.

T/F: The line containing a “throw” statement is known as the throw point.

True, this is where an exception is raised.

T/F: Function templates allow you to write a single function definition that works with many diffrent data types

True, they enable code reuse and flexibility by allowing the same function to operate on varying types without rewriting code.

T/F: Using a function template requires less code than overloading a function

True, function templates provide a more concise way to handle multiple data types without repeating the same logic.