A Relaxed Guide to memory_order_relaxed Hans Boehm Paul E. McKenney Google Facebook CPPCON 2020std::atomic/std::atomic_ref and memory_order_relaxed ● C++ atomic demonstrably correct even in strict C++20.Questions? References: Boehm & McKenney, “P2055: A Relaxed Guide to memory_order_relaxed” We recklessly assumed: Boehm, “"P2215: Undefined behavior" and the concurrency

. . . . . . . . . . . . . . . . . . . . . . . . . 7 2 What’s new in Conan 2 9 2.1 Conan 2 migration guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 New features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 5 Devops guide 143 5.1 Using ConanCenter packages in production environments . . . . . . . . . . . . . . . . . able to live in the same server repositories. 2.1 Conan 2 migration guide If you are using Conan 1.X, please read the Conan 2 Migration guide , to start preparing your package recipes to 2.0 and be aware

. . . . . . . . . . . . . . . . . . . . . . . . . 7 2 What’s new in Conan 2 9 2.1 Conan 2 migration guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 New features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 5 Devops guide 143 5.1 Using ConanCenter packages in production environments . . . . . . . . . . . . . . . . . able to live in the same server repositories. 2.1 Conan 2 migration guide If you are using Conan 1.X, please read the Conan 2 Migration guide , to start preparing your package recipes to 2.0 and be aware

. . . . . . . . . . . . . . . . . . . . . . . . . 7 2 What’s new in Conan 2 9 2.1 Conan 2 migration guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 New features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 5 Devops guide 143 5.1 Using ConanCenter packages in production environments . . . . . . . . . . . . . . . . . able to live in the same server repositories. 2.1 Conan 2 migration guide If you are using Conan 1.X, please read the Conan 2 Migration guide , to start preparing your package recipes to 2.0 and be aware

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Conan migration guide to 2.0 7 2.1 Migrating the recipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . questions? Please check out our FAQ section or . 6 Chapter 1. Introduction CHAPTER TWO CONAN MIGRATION GUIDE TO 2.0 Tip: Conan 2.0 is already released, you can install the latest Conan version from PyPI build_requires("nasm/2.15.05") self.build_requires("gtest/0.1", force_host_context=True) 8 Chapter 2. Conan migration guide to 2.0 Conan Documentation, Release 1.63.0 Listing 4: To: from conan import ConanFile class

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Conan migration guide to 2.0 7 2.1 Migrating the recipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . questions? Please check out our FAQ section or . 6 Chapter 1. Introduction CHAPTER TWO CONAN MIGRATION GUIDE TO 2.0 Tip: Conan 2.0 is already released, you can install the latest Conan version from PyPI build_requires("nasm/2.15.05") self.build_requires("gtest/0.1", force_host_context=True) 8 Chapter 2. Conan migration guide to 2.0 Conan Documentation, Release 1.64.1 Listing 4: To: from conan import ConanFile class

. . . . . . . . . . . . . . . . . . . . . . . . . 7 2 What’s new in Conan 2 9 2.1 Conan 2 migration guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 New features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 5 Devops guide 143 5.1 Using ConanCenter packages in production environments . . . . . . . . . . . . . . . . . able to live in the same server repositories. 2.1 Conan 2 migration guide If you are using Conan 1.X, please read the Conan 2 Migration guide , to start preparing your package recipes to 2.0 and be aware

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Conan migration guide to 2.0 7 2.1 Migrating the recipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . questions? Please check out our FAQ section or . 6 Chapter 1. Introduction CHAPTER TWO CONAN MIGRATION GUIDE TO 2.0 Tip: Conan 2.0 is already released, you can install the latest Conan version from PyPI build_requires("nasm/2.15.05") self.build_requires("gtest/0.1", force_host_context=True) 8 Chapter 2. Conan migration guide to 2.0 Conan Documentation, Release 1.60.2 Listing 4: To: from conan import ConanFile class

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Conan migration guide to 2.0 7 2.1 Migrating the recipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . questions? Please check out our FAQ section or . 6 Chapter 1. Introduction CHAPTER TWO CONAN MIGRATION GUIDE TO 2.0 Tip: Conan 2.0 is already released, you can install the latest Conan version from PyPI so if new requirement traits are used in Conan 2.0, they will not error. 8 Chapter 2. Conan migration guide to 2.0 Conan Documentation, Release 1.64.1 2.1.3 Settings • Do not use dictionary expressions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Conan migration guide to 2.0 7 2.1 Migrating the recipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . questions? Please check out our FAQ section or . 6 Chapter 1. Introduction CHAPTER TWO CONAN MIGRATION GUIDE TO 2.0 Tip: Conan 2.0 is already released, you can install the latest Conan version from PyPI build_requires("nasm/2.15.05") self.build_requires("gtest/0.1", force_host_context=True) 8 Chapter 2. Conan migration guide to 2.0 Conan Documentation, Release 1.61.0 Listing 4: To: from conan import ConanFile class