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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When Nanoseconds Matter: Ultrafast Trading Systems in C++ CppCon 2024 Thursday, 19 September 2024 David Gross Introduction 2 • About me - Leading the Options Automated Trading else { levels.insert(it, {price, volume}); } }I-Cache misses – Immediately Invoked Function Expressions (IIFE) 59 template void DeleteOrder(T& levels, Price price, Volume volume if (it->second <= 0) { levels.erase(it); } } I-Cache misses – Immediately Invoked Function Expressions (IIFE)61 template void DeleteOrder(T& levels, Price price, Volume volume

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

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

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6 Control Flow Basics 33 6.1 if expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6.2 Loops . . . . . . 6.2.2 loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.3 break and continue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 6.3.1 Labels . . . . . . course internally at Google. We typically run classes from 9:00 am to 4:00 pm, with a 1 hour lunch break in the middle. This leaves 3 hours for the morning class and 3 hours for the afternoon class. Both