Functions are a fundamental concept in programming; regardless of the topic we discuss, we end up writing functions. Trying to cover functions in a single chapter is not only hard but also not very rational. Being a fundamental element of the language, functions are encountered in every recipe of this book. This chapter, however, covers modern language features related to functions and callable objects, with a focus on lambda expressions, concepts from functional languages such as higher-order functions, and type-safe functions with a variable number of arguments.
The recipes included in this chapter are as follows:
- Defaulted and deleted functions
- Using lambdas with standard algorithms
- Using generic and template lambdas
- Writing a recursive lambda
- Writing a function template with a variable number of arguments
- Using fold expressions to simplify variadic function templates
- Implementing the higher-order functions...