More Exceptional C++

Chapter 38. Typedef

Difficulty: 3

Why use typedef? Besides the many traditional reasons, we'll consider typedef techniques that make using the C++ standard library safer and easier.

1. Why use typedef? Name as many situations/reasons as you can.

2. Why is typedef such a good idea in code that uses standard (STL) containers?

Solution

Typedef: Controlling What's in a Name

To recap, writing typedef allows you to assign another equivalent name for a type. For example,

typedef vector< vector<int> > IntMatrix;

lets you write the simpler IntMatrix in place of the more verbose vector< vector<int> >.

• 1. Why use typedef? Name as many situations/reasons as you can.

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