77Rewrite; Power Peg Moved, Not Removed 78Did Not Retest Power Peg 79Deploy Version to Support RLP 80Manual Deployment Mistake 81No Review or Test of Deployment 82RLP Goes Live on 7 Servers 83Power Peg Peg in 2003, dead code still around •Refactored code in 2005 ; moved dead code ; test still pass •Manual deployment ; no review ; no tests •Different components had different view of same thing •email Peg in 2003, dead code still around •Refactored code in 2005 ; moved dead code ; test still pass •Manual deployment ; no review ; no tests •Different components had different view of same thing •email

Profiling Zoo holistic (automatic) issues: information overload; profiling overhead (skew) selective (manual) Sampling callstack snapshot probing system-wide automatic (regular intervals) OS kernel events Profiling Zoo holistic (automatic) issues: information overload; profiling overhead (skew) selective (manual) Sampling callstack snapshot probing system-wide automatic (regular intervals) OS kernel events TracyClient.cpp TracyClient.cpp TracyClient.cpp TracyClient.cpp Behold the Tracy Multiverse! (Tracy Manual, Section 2.1.5)18 Tracy integration across shared libraries tracy (shared library) TracyClient

Profiling Zoo holistic (automatic) issues: information overload; profiling overhead (skew) selective (manual) Sampling callstack snapshot probing system-wide automatic (regular intervals) OS kernel events Profiling Zoo holistic (automatic) issues: information overload; profiling overhead (skew) selective (manual) Sampling callstack snapshot probing system-wide automatic (regular intervals) OS kernel events ZoneScoped; ... } ... { ZoneScoped; ... } }23 Tracy manual, Section 3.1 Tracy Zoning 101 int foo() { ZoneScoped; ... if (!spoon) { Zo

PARAPHRASING P2561 "How is this problem solved today? Either: "How is this problem solved today? Either: manual error propagation macros (most libraries e.g. Boost.Outcome) The only things that have nice syntax multiple (possibly failing) values. to multiple (possibly failing) values. Goals: Goals: no macros no manual control �ow declarative expression-oriented style good-looking code e�cient Let's do it with Let's return std::format("{}{}", f, b); }); }); } 37HOW DID WE DO? HOW DID WE DO? No macros? No manual control �ow? Declarative style? Good-looking code? E�cient? 38APPLICATIVE SOLUTION APPLICATIVE

了 了 struct chunk { std: :ptrdiff_t begin; std::ptrdiff_t end; }; auto func (chunk) -> void; auto manual_loop (std: :ptrdiff_t n，std::ptrdiff_t chunk_count) -> void [[assumeCn >= 0)]]; [[assume(chunk_count 一Range adaptorfor dlstributing work across tasks (CZ) ASM comparison > GCC RISC-V 64-bit assembly manual_loop(long，long): jsc-chunk_evenly (long，long): addiji sp,sp,-64 sp,sSp,64 j工 Ia CP and LCD comparison 1o0恒 80 60 40 20 上 manual 1oop jsc: :chunk_evenly() 大 manual loop 时 jsc: :chunk_evenly() 50 40 30 20 10 WE W 和中

Source breaking change (can’t compile 2 as 3) Python 2 Python 3 x = 3/2 x == 2 x == 1.5 Manual migration + tools (2to3, Pylint, Futurize, Modernize, caniusepython3, tox, mypy) 2017: Most Python Source breaking change (can’t compile 2 as 3) Python 2 Python 3 x = 3/2 x == 2 x == 1.5 Manual migration + tools (2to3, Pylint, Futurize, Modernize, caniusepython3, tox, mypy) 2017: Most Python Source breaking change (can’t compile 2 as 3) Python 2 Python 3 x = 3/2 x == 2 x == 1.5 Manual migration + tools (2to3, Pylint, Futurize, Modernize, caniusepython3, tox, mypy) 2017: Most Python

second)(8.0) 8.0_mps // New manual definition 😞 38.1Unit symbol APIs (e.g., literals) Functions UDLs meters(3.0) 3.0_m (meters / second)(8.0) 8.0_mps // New manual definition 😞 meters(3.0f) ? APIs (e.g., literals) Functions UDLs meters(3.0) 3.0_m (meters / second)(8.0) 8.0_mps // New manual definition 😞 meters(3.0f) ??? meters(dist_m) ??? 38.3Unit symbol APIs (e.g., literals) Functions Functions UDLs Unit Symbols meters(3.0) 3.0_m 3.0 * m (meters / second)(8.0) 8.0_mps // New manual definition 😞 8.0 * m / s meters(3.0f) ??? 3.0f * m meters(dist_m) ??? dist_m * m 38.4Inter-library

std::shared_ptr - Python - Objective-C (manual or automatic – see ARC) - Swift - COM – AddRef()/Release() - Non-Reference counted - .NET - JVM - JavaScript Manual memory management is rarely advocated advocated for anymore.Memory model – Manual Memory is allocated and deallocated directly. Allocation locations are static. ptr = new int[10]; // 0x2600 ptr delete[] ; // 0x2600 Could have been deleted

dyndep https://ninja-build.org/manual.html#ref_dyndep • May 2019 ninja merged all of the changes to support Fortran because of C++ modules! 16https://ninja-build.org/manual.html#ref_dyndep Some use cases hoffman@kitware.com • Read “how to write a CMake buildsystem” – https://cmake.org/cmake/help/latest/manual/cmake-buildsystem.7.html/Explore the CMake documentation • Explore the CMake documentation – https://www

of end() end() begin() ++ pos end() begin() filter ++ pos ©2024 by josuttis.com 34 C++ • Manual iteration: 5 6 8 7 0 1 3 4 2 14 9 10 11 12 13 20 21 22 23 15 16 17 18 19 29 24 25 27 28 26 end() pos Nico Josuttis C++ Filter View @cppcon 2024-09-17 19©2024 by josuttis.com 39 C++ • Reverse manual iteration: 5 6 8 7 0 1 3 4 2 14 9 10 11 12 13 20 21 22 23 15 16 17 18 19 29 24 25 27 28 26 end() One call of end() begin() end() reverse on filter -- pos ©2024 by josuttis.com 40 C++ • Reverse manual iteration: 5 6 8 7 0 1 3 4 2 14 9 10 11 12 13 20 21 22 23 15 16 17 18 19 29 24 25 27 28 26 end()