Back to Basics Lambda Expressions Barbara Geller & Ansel Sermersheim CppCon September 2020Introduction ● Prologue ● History ● Function Pointer ● Function Object ● Definition of a Lambda Expression slot library ○ CsLibGuarded ■ library for managing access to data shared between threadsLambda Expressions ● History ○ lambda calculus is a branch of mathematics ■ introduced in the 1930’s to prove memory ■ languages which were influenced by lambda calculus ● Haskell, LISP, and ML 5Lambda Expressions ● History ○ why do we use the terminology lambda expression ■ greek letter λ refers to an anonymous

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Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 13 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 13 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 13 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 13 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 13 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 9 3.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.10 Byte Array Literals . . . . . . . 88 9 Control Flow 89 9.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 9.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 9 3.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.10 Byte Array Literals . . . . . . . 88 9 Control Flow 89 9.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 9.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .

Variable Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.2 Assignment expressions and assignment versus mutation . . . . . . . . . . . . . . 12 4.3 Stylistic Conventions . . . Non-Standard String Literals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.9 Regular Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 8.10 Byte Array Literals . . . . . . 93 10 Control Flow 94 10.1 Compound Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 10.2 Conditional Evaluation . . . . . . . . . . . . . . . . . . . .