Sams Teach Yourself C++ in One Hour a Day, 9th Edition

Lesson 22

Lambda Expressions

Lambda expressions, which were introduced in C++11 and have been improved in more recent versions of C++, define function objects without requiring a class or a struct with a name. Recent amendments in C++20 add support for template arguments.

In this lesson, you find out

• ■   How to program a lambda expression

• ■   How to use lambda expressions as predicates

• ■   What generic lambda expressions are

• ■   How to program lambda expressions that can hold and manipulate state

What Is a Lambda Expression?

A lambda expression can be visualized as a compact version of an unnamed struct (or class) with a public operator() function. In that sense, a lambda expression is a function object. Before we get into programming lambda ...