Scala for the Impatient, 3rd Edition

Chapter 19. Contextual Abstractions

Topics in This Chapter L3

• 19.1 Context Parameters

• 19.2 More about Context Parameters

• 19.3 Declaring Given Instances

• 19.4 Givens in for and match Expressions

• 19.5 Importing Givens

• 19.6 Extension Methods

• 19.7 Where Extension Methods Are Found

• 19.8 Implicit Conversions

• 19.9 Rules for Implicit Conversions

• 19.10 Importing Implicit Conversions

• 19.11 Context Functions

• 19.12 Evidence

• 19.13 The @implicitNotFound Annotation

• Exercises

The Scala language provides a number of powerful tools for carrying out work that depends on a context—settings that are configured depending on current needs. In this chapter, you will learn how to build capabilities that can be added in an ad-hoc fashion to class hierarchies, how to ...