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Add C++20 Supports #1
Description
需要支持以下内容：
- 语言级 bug 与修订
- 类型系统改进 Type Punning
- 弃用和删除的功能
- register
- std::auto_ptr --> std::unique_ptr
- std::random_shuffle
- std::bind1st, std::bind2nd, ...
- 语言增强
- 结构化绑定 Structured bindings
- 新的控制结构
constexprif - 编译时条件语句 Compile-time conditional statements
- 新的聚合规则
- 强制性 RVO 和复制 elision, Guaranteed copy elision
- Unary
static_assert - 嵌套命名空间 Nested namespace deinitions
- inline 变量
inlinevariables -
constexpr改进, constexpr lambda
- 模板增强
- 折叠表达式 Fold expressions
- 类模板参数推导 Class template deduction
- variadic templates fold
-
autonon-type template parameters - Preprocessor predicate for header testing (
__has_include)
- 容器
-
std::string_view,std::byte加入 container 容器一章 -
std::any,std::variant,std::optional加入 container 容器一章 - 容器改进
- 线程
- thread 并行 STL 算法
-
std::shared_mutex,atomic<T>::is_always_lockfree,scoped_lock<Mutexes...>
- 文件系统
- [文件系统库, 专门用一章来讲解](http://en.cppreference.com/w/cpp/filesystem, http://www.bfilipek.com/2017/08/cpp17-details-filesystem.html)
- 数学库
- 其他特性
- Polymorphic allocators and memory resources
- Aligned
new - Improved insertion and splicing for associative constrainers
- Boolean logic metafunctions
...
- 展望 C++20
- concept
- module
- coroutine
- Ranges
Activity
[-]增加对 C++17 的支持[/-][+]增加对 C++17 的支持（发布第二版）[/+]revision #1: preface 增加对 C++17 的支持
revision #1: 第 1 章增加了对 C++17 的支持
revision #1: 增加习题说明，修正部分格式问题
revision #1: 第二章前半部分内容完整支持 C++17
revision #1: 更新第二章中已维护的代码
revision: #1 更新目录
revision #1: 更新附录
update #1: add appendix2 and init filesystem chapter
[-]增加对 C++17 的支持（发布第二版）[/-][+]增加对 C++20 的支持（发布第二版）[/+]see #1: concepts demo
15 remaining items
changkun commentedon Jun 7, 2026
Progress: added §2.7 covering three more C++17 language features (#322): inline variables, nested namespace definitions, and constexpr lambda — each with a runnable, compiled example under
code/2. Boxes ticked above.book: add C++17 single-argument static_assert
book: add C++17 guaranteed copy elision
book: add C++17 std::string_view and std::byte
book: write Chapter 8 (filesystem)
book: add C++17 new aggregate rules and boolean logic metafunctions
book: add C++17 associative container improvements and std::pmr
book: add C++17 aligned new for over-aligned types
changkun commentedon Jun 7, 2026
Progress: wrote Chapter 8 (filesystem) in full (was a TODO stub) with a runnable example, and added more C++17 features — new aggregate rules, boolean logic metafunctions, associative-container improvements (
try_emplace/insert_or_assign/extract/merge), polymorphic allocators (std::pmr), and alignednew. All with compiled examples undercode/. Boxes ticked above.book: add type punning (memcpy/bit_cast) and math special functions
book: add C++17 __has_include preprocessor operator
book: fill Chapter 10 (C++20) and fix Contracts/TM factual errors
book: write Appendix 2 (modern C++ best practices)
changkun commentedon Jun 7, 2026
Closing: roadmap complete
All checklist items above are now ticked, and the previously incomplete chapters have been written:
Filled book content (zh + en, each with compiled
code/examples):path, status queries (exception vserror_code), directory iteration, create/copy/remove, runnable example.C++17 features added to chapters 2/3/4/9 (each with a compiled example):
inline variables, nested namespaces, constexpr lambda, single-argument
static_assert, new aggregate rules, boolean logic metafunctions,__has_include, guaranteed copy elision,std::string_view,std::byte, associative-container improvements,std::pmr, alignednew, type punning (std::memcpy/std::bit_cast), and math special functions (documented with a libc++ support caveat).Verification: all 20 new/changed
code/examples compile and run under the project'sclang++ -std=c++2a -pedantic.Future standards are tracked separately in #317 (C++23) and #318 (C++26). Closing this as done.