release: v0.9.0 ready#124
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vol4-advanced/vol3-metaprogramming-cpp20-23 子卷前三篇: - 01 Concepts 详解(四种语法形式/enable_if 报错对比/标准库概念) - 02 约束模板(subsumption 与重载/原子约束真包含) - 03 requires 表达式(四种成分/不求值/硬错误坑) 配套 9 个示例;报错演示用 -D 宏切换。index 改正式导航。
Steve Downey《The Evolution of std::optional: From Boost to C++26》 拆 6 篇深度笔记,聚焦 optional<T&>(P2988) 从 2005 提出到 2025 年 Sofia 会议投票通过进 C++26 的历程。引用三重身份、assign-through 与 rebind 之争、赋值重绑定、浅层 const、移动语义陷阱、The Beman Project 标准化真相。全部 optional<T&> 代码在 GCC 16.1.1 -std=c++26 实跑,附赋值汇编实证。修正了素材的 CTAD 误断与 Beman 拼写。 接入 2025 目录页。四门禁(validate_frontmatter/check_links/ check_quality/build)全绿。
ch00/05 移动语义实战: - 修正 benchmark 数据硬伤(原文「285ms/3倍」与实测矛盾)→ GCC16 实测重写 - 补全 noexcept 验证代码(原缺 ThrowingType,代码与输出对不上) - 清死链 code/volumn_codes/vol2/ch00-move-semantics(空目录) - 新增 2 个 OnlineCompilerDemo(push_back_emplace、noexcept_sort_vs_realloc) ch01 智能指针 6 篇 CN: - 人称统一(笔者/咱们/您)、删「## 小结」换承接、清 AI 味词、工具链 GCC16 - 修实测硬伤: · raii-deep-dive:exit 验证缺 main(给了输出却链接不过) · unique-ptr:sizeof 代码缺 StatefulDeleter 但输出里有;5 处死链 + PIMPL 死链 · weak-ptr:lock() 实测慢 ~32 倍(原文写 10-15 倍,把直接访问耗时写高了) · custom-deleter:11 处死链 + 末尾整段「## 验证代码」死链 + 535-536 重复行 · scope-guard:验证段死链 新增 code/examples/vol2: noexcept_sort_vs_realloc.cpp、move_benchmark.cpp、push_back_emplace.cpp(均 GCC16 编译验证) EN 同步 ch00/05 + ch01/01-04
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v0.9.0的大体框架更新差不多了，这里准备一下，晚上回来发版