--- title: "C++26: Reflection, Memory Safety, Contracts, and a New Async Model" source_name: "InfoQ" original_url: "https://www.infoq.com/news/2026/04/cpp-26-reflection-safety-async/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global" canonical_url: "https://www.traeai.com/articles/2d57b4c7-1185-47ca-aea1-10248743f384" content_type: "article" language: "英文" score: 5.5 tags: ["C++","C++26","编程语言","内存安全","异步编程"] published_at: "2026-04-17T15:00:00+00:00" created_at: "2026-04-17T19:14:46.230633+00:00" --- # C++26: Reflection, Memory Safety, Contracts, and a New Async Model Canonical URL: https://www.traeai.com/articles/2d57b4c7-1185-47ca-aea1-10248743f384 Original source: https://www.infoq.com/news/2026/04/cpp-26-reflection-safety-async/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global ## Summary 文章标题预告C++26将引入反射、内存安全、契约和新异步模型，但正文内容缺失，仅含网站导航和广告。 ## Key Takeaways - 文章仅有标题提及C++26四大特性，无实质技术细节 - 正文被InfoQ网站模板、Cookie提示和注册引导占据 - 无法验证所述C++26特性内容的真实性或深度 ## Content Title: C++26: Reflection, Memory Safety, Contracts, and a New Async Model URL Source: http://www.infoq.com/news/2026/04/cpp-26-reflection-safety-async/ Published Time: 2026-04-17T15:00:00+0000 Markdown Content: # C++26: Reflection, Memory Safety, Contracts, and a New Async Model - InfoQ # Your choice regarding cookies on this site We use cookies to optimise site functionality and give you the best possible experience. 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The finalized draft introduces reflection, enhances memory safety without requiring code rewrites, adds contracts with preconditions and postconditions alongside a new assertion statement, and establishes a unified framework for concurrency and parallelism. Reflection is a mechanism that, as Sutter explains, [gives developers the keys to C++ internal machinery](https://www.youtube.com/watch?v=7z9NNrRDHQU), enabling the language to describe itself and generate code, and thus provide a solid foundation for metaprogramming. True to C++'s spirit, reflection comes with no runtime overhead. As a basic example of what reflection allows, the following code snippet shows how reflection enables a specialized syntax for declaring C++ interfaces: ```cpp class(interface) IFoo { int f(); void g(std::string); }; //-- will be translated into the "classical": class IFoo { public: virtual int f() = 0; virtual void g(std::string) = 0; virtual ~IFoo() = default; IFoo() = default; protected: IFoo(IFoo const&) = default; void operator=(IFoo const&) = default; }; ``` > Reflection can simplify C++’s future evolution by reducing the need for as many bespoke new language features, since many can now be expressed as reusable compile-time libraries—faster to design, easier to test, and portable from day one. The `interface` abstraction is part of [cppfront, a compiler that builds to pure ISO C++](https://github.com/hsutter/cppfront), which Sutter created to provide a faster way to experiment with proposals. It also includes abstractions like `copyable` for expressing a type with copy/move construction/assignment; `ordered` for defining a totally ordered type with `operator<=>`; `union` for a tagged union with names; `regex`, and more. Another area where C++26 aims to deliver significant improvements is [memory safety](https://www.infoq.com/news/2024/04/cpp-memory-safety-sutter/). This includes out-of-the-box elimination of _undefined behavior_ when reading uninitialized local variables, as well as bounds safety for most standard library types, including `vector`, `span`, `string`, `string_view`. These changes have been already deployed in production at Apple and Google, Sutter says, across hundreds of millions of lines of C++ code: > This is no just-on-paper design. At Google alone, it has already fixed over 1,000 bugs, is projected to prevent 1,000 to 2,000 bugs a year, and has reduced the segfault rate across the production fleet by 30%. Even more significantly, these benefits where achieved simply by recompiling existing code with the new compiler. In only seven cases was the compiler unable to analyze highly optimized code, requiring developers to use a fine-grained API to selectively opt out of memory safety in those specific parts. C++26 contracts bring [_defensive programming_](https://herbsutter.com/2025/10/01/my-other-cppcon-talk-video-is-now-available-the-joy-of-c26-contracts-and-some-myth-conceptions/) into the language, improving both functional and memory safety. They allow developers to express pre- and post-conditions that must not be violated across a method execution. Contracts allow to move assertions into function declarations making them visible to callers and static analysis tools. C++ offers four ways to handle contract violations: ignore, observe, enforce, and quick enforce. In addition, they bring a native assertion mechanism that replaces C's `assert` macro. Finally, C++26 introduces [`std::execution`](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2300r10.html) as a framework to express and control concurrency and parallelism. The three main abstractions in the framework are _schedulers_, _senders_, and _receivers_, which can be composed through a set of customizable asynchronous algorithms. `std::execution` is designed to work nicely with C++20 coroutines and makes it easier to "write programs that use _structured_ (rigorously lifetime-nested) concurrency and parallelism to be data-race-free by construction". The two major C++ compilers, GCC and Clang, have already implemented most of C++26 features during the standardization process and these features will soon make their way into mainline releases. ## About the Author [![Image 11](https://cdn.infoq.com/statics_s2_20260409104741/images/profiles/NovciOoQOAYWqYqRQBFo97SuMm0xbUiC.jpg)](http://www.infoq.com/profile/Sergio-De-Simone/) #### **Sergio De Simone** **Sergio De Simone** is a software engineer. Sergio has been working as a software engineer for over twenty five years across a range of different projects and companies, including such different work environments as Siemens, HP, and small startups. For the last 10+ years, his focus has been on development for mobile platforms and related technologies. He is currently working for BigML, Inc., where he leads iOS and macOS development. 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