II. Implementing an Agile Approach 3 Deciding to Adopt an Agile Approach Agile represents a radical shift from industrial age processes to a modern management and development approach suited to the

2 cppfront: Recap Safety for C++ 50 esp. guaranteed program-meaningful initialization Simplicity for C++ 10 esp. for programmers cppfront: What’s new Types, reflection, metafunctions, … Simplification CppCon 2019 Parameter passing d0708 CppCon 2020 Patmat using is and as P2392 CppCon 2021 Simplicity (goal: 10 less to know) Context-free, order independent “Zero-overhead” backward compatibility conferences9 cppfront: Recap Safety for C++ 50 esp. guaranteed program-meaningful initialization Simplicity for C++ 10 esp. for programmers cppfront: What’s new Types, reflection, metafunctions, … Simplification

inspect. What does "good code" mean for unit tests? Part 2: Code Readability 49Readability Simplicity! Jon Jagger: Unit tests should have a cyclomatic complexity of 1 Unit Tests should have no logic even more rare. Aspirational Goal, Not Rule “Simplicity is prerequisite for reliability.” ― Edsger W. Dijkstra Part 2: Code Readability Simplicity 50Readability float compute_pi() { return std::acos(-1); the code under test even if they don't know what it's supposed to do Part 2: Code Readability Simplicity 54Step 3: Interesting Conditions "Interesting" values derive from studying the algorithm and

Suggest Better ways Ask about Simplicity Remind about Evolution Identify Technical DebtWhat-If? Did you consider? Suggest Better ways Ask about Simplicity Remind about Evolution Identify Mistakes by Navigator Actual mistakesHow about… Discuss & implement Better ways Ensure Simplicity Enable Evolution Address Technical Debt Evaluate more options!High- Ownership Functional

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Only values, not variables, have types – variables are simply names bound to values, although for simplicity we may say "type of a variable" as shorthand for "type of the value to which a variable refers" actual definition of Julia's Rational immutable type (except that we omit the constructor here for simplicity), representing an exact ratio of integers: struct Rational{T<:Integer} <: Real num::T den::T Square Bracket U+023B6 \bbrktbrk Bottom Square Bracket Over Top Square Bracket U+023B7 \sqrtbottom Radical Symbol Bottom U+023B8 \lvboxline Left Vertical Box Line U+023B9 \rvboxline Right Vertical Box Line

Only values, not variables, have types – variables are simply names bound to values, although for simplicity we may say "type of a variable" as shorthand for "type of the value to which a variable refers" actual definition of Julia's Rational immutable type (except that we omit the constructor here for simplicity), representing an exact ratio of integers: struct Rational{T<:Integer} <: Real num::T den::T Square Bracket U+023B6 \bbrktbrk Bottom Square Bracket Over Top Square Bracket U+023B7 \sqrtbottom Radical Symbol Bottom U+023B8 \lvboxline Left Vertical Box Line U+023B9 \rvboxline Right Vertical Box Line

Only values, not variables, have types – variables are simply names bound to values, although for simplicity we may say "type of a variable" as shorthand for "type of the value to which a variable refers" actual definition of Julia's Rational immutable type (except that we omit the constructor here for simplicity), representing an exact ratio of integers: struct Rational{T<:Integer} <: Real num::T den::T Square Bracket U+023B6 \bbrktbrk Bottom Square Bracket Over Top Square Bracket U+023B7 \sqrtbottom Radical Symbol Bottom U+023B8 \lvboxline Left Vertical Box Line U+023B9 \rvboxline Right Vertical Box Line

Only values, not variables, have types – variables are simply names bound to values, although for simplicity we may say "type of a variable" as shorthand for "type of the value to which a variable refers" actual definition of Julia's Rational immutable type (except that we omit the constructor here for simplicity), representing an exact ratio of integers: struct Rational{T<:Integer} <: Real num::T den::T Square Bracket U+023B6 \bbrktbrk Bottom Square Bracket Over Top Square Bracket U+023B7 \sqrtbottom Radical Symbol Bottom U+023B8 \lvboxline Left Vertical Box Line U+023B9 \rvboxline Right Vertical Box Line

Only values, not variables, have types – variables are simply names bound to values, although for simplicity we may say "type of a variable" as shorthand for "type of the value to which a variable refers" actual definition of Julia's Rational immutable type (except that we omit the constructor here for simplicity), representing an exact ratio of integers: struct Rational{T<:Integer} <: Real num::T den::T Square Bracket U+023B6 \bbrktbrk Bottom Square Bracket Over Top Square Bracket U+023B7 \sqrtbottom Radical Symbol Bottom U+023B8 \lvboxline Left Vertical Box Line U+023B9 \rvboxline Right Vertical Box Line