Use Mapped Lambdas for a Jump Table

A jump table is a useful pattern when we want to select an action from a user or other input. Jump tables are often implemented in if/else or switch structures. In this recipe, we’ll build a concise jump table using only an STL map and anonymous lambdas.

How to do it

It’s easy to build a simple jump table from a map and lambdas. The map provides simple indexed navigation and the lambda can be stored as payload. Here’s how to do it:

• First, we’ll create a simple prompt() function to get input from the console: