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      1. 哪些 Boost 特性与 C++11 重叠?

        Which Boost features overlap with C++11?(哪些 Boost 特性与 C++11 重叠?)
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                  本文介绍了哪些 Boost 特性与 C++11 重叠?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  几年前我把我的 C++ 技能放在了架子上,现在看来,当我再次需要它们时,情况发生了变化.

                  I put my C++ skills on the shelf several years ago and it seems now, when I need them again, the landscape has changed.

                  我们现在已经有了 C++11,我的理解是它与许多 Boost 特性重叠.

                  We have got C++11 now, and my understanding is that it overlaps many Boost features.

                  是否有一些重叠之处的总结,哪些 Boost 库将成为遗产,建议使用哪些 C++11 特性而不是 boost 特性,哪些最好不要?

                  Is there some summary where those overlaps lie, which Boost libraries going to become legacy, recommendation of which C++11 features to use instead of boost ones and which better not?

                  推荐答案

                  可由 C++11 语言特性或库替换

                  Replaceable by C++11 language features or libraries

                  • Foreach → 基于范围
                  • Functional/Forward → 完美转发(使用 右值引用、可变参数模板 和 std::转发)
                  • 现场工厂,输入工厂→ 完美转发(至少对于记录在案的用例而言)
                  • Lambda → Lambda 表达式(在非多态情况下)
                  • 本地函数 → Lambda 表达式
                  • 最小-最大 → std::minmax, std::minmax_element
                  • 比率 → std::ratio
                  • 静态断言 → static_assert
                  • 线程 → <线程> 等(但请检查这个问题).
                  • Typeof → auto, decltype
                  • 值初始化 → 列表初始化(§8.5.4/3)
                  • 数学/特殊函数→ ,见下表
                    • 伽马函数 (tgamma)、对数伽马函数 (lgamma)
                    • 误差函数(erf、erfc)
                    • log1p, expm1
                    • cbrthypot
                    • acoshasinhatanh
                    • Foreach → range-based for
                    • Functional/Forward → Perfect forwarding (with rvalue references, variadic templates and std::forward)
                    • In Place Factory, Typed In Place Factory → Perfect forwarding (at least for the documented use cases)
                    • Lambda → Lambda expression (in non-polymorphic cases)
                    • Local function → Lambda expression
                    • Min-Max → std::minmax, std::minmax_element
                    • Ratio → std::ratio
                    • Static Assert → static_assert
                    • Thread → <thread>, etc (but check this question).
                    • Typeof → auto, decltype
                    • Value initialized → List-initialization (§8.5.4/3)
                    • Math/Special Functions → <cmath>, see the list below
                      • gamma function (tgamma), log gamma function (lgamma)
                      • error functions (erf, erfc)
                      • log1p, expm1
                      • cbrt, hypot
                      • acosh, asinh, atanh

                      TR1(它们在文档中被标记,如果那些是 TR1 库)

                      TR1 (they are marked in the documentation if those are TR1 libraries)

                      • 数组 → std::array
                      • 绑定 → std::绑定
                      • 启用如果→ std::enable_if
                      • 函数 → std::function
                      • 成员函数 → std::mem_fn
                      • 随机 → <随机>
                      • Ref → std::ref, std::cref
                      • 正则表达式 →
                      • 结果 → std::result_of
                      • Smart Ptr → std::unique_ptr, std::shared_ptr, std::weak_ptr (但是 boost::intrusive_ptr 仍然不能被替换)
                      • 交换(交换数组)→ std::swap
                      • 元组 → std::tuple
                      • 类型特征 →
                      • 无序 → , <;unordered_map>
                      • Array → std::array
                      • Bind → std::bind
                      • Enable If → std::enable_if
                      • Function → std::function
                      • Member Function → std::mem_fn
                      • Random → <random>
                      • Ref → std::ref, std::cref
                      • Regex → <regex>
                      • Result Of → std::result_of
                      • Smart Ptr → std::unique_ptr, std::shared_ptr, std::weak_ptr (but boost::intrusive_ptr still cannot be replaced)
                      • Swap (swapping arrays) → std::swap
                      • Tuple → std::tuple
                      • Type Traits → <type_traits>
                      • Unordered → <unordered_set>, <unordered_map>

                      从 C++11 向后移植的功能:

                      Features back-ported from C++11:

                      • 原子 ← std::atomic
                      • 计时 ← <计时>(见下文)
                      • Move ← 右值引用
                      • Atomic ← std::atomic
                      • Chrono ← <chrono> (see below)
                      • Move ← Rvalue references

                      可替换为 C++17 语言特性:

                      Replaceable by C++17 language features:

                      • String_ref → 标准::string_view
                      • 文件系统 → (文件系统 TS)
                      • 可选 → std::optional (图书馆基础 TS v1)
                      • 任何 → std::any(库基础 TS v1)
                      • 数学/特殊函数→ (特殊数学是),见下表
                        • 测试功能
                        • (正常/相关/球面)勒让德多项式
                        • (正态/关联)勒让德多项式
                        • 厄米多项式
                        • Bessel (J/Y/I/K) 函数(Y 在 C++ 中称为 Neumann 函数)
                        • 球形贝塞尔 (j/y) 函数
                        • (第一类/第二类/第三类)的(不完全/完全)椭圆积分
                        • 黎曼 zeta 函数
                        • 指数积分 Ei
                        • String_ref → std::string_view
                        • Filesystem → <filesystem> (Filesystem TS)
                        • Optional → std::optional (Library Fundamentals TS v1)
                        • Any → std::any (Library Fundamentals TS v1)
                        • Math/Special Functions → <cmath> (Special Math IS), see the list below
                          • beta function
                          • (normal / associated / spherical) Legendre polynomials
                          • (normal / associated) Legendre polynomials
                          • Hermite polynomials
                          • Bessel (J / Y / I / K) functions (Y is called Neumann function in C++)
                          • spherical Bessel (j / y) functions
                          • (incomplete / complete) elliptic integrals of (first / second / third kind)
                          • Riemann zeta function
                          • exponential integral Ei

                          标准团队仍在努力:

                          • 数学公因数 →std::experimetal::gcd、lcm(库基础 TS v2)
                          • 概念检查 → 概念 TS
                          • 范围 → 范围 TS
                          • Asio → 网络 TS(套接字和定时器仅)
                          • 多精度 → 数字 TS
                          • 协程/Coroutine2 → 协程 TS
                          • Math Common Factor → std::experimetal::gcd, lcm (Library Fundamentals TS v2)
                          • Concept check → Concepts TS
                          • Range → Range TS
                          • Asio → Networking TS (sockets and timers only)
                          • Multiprecision → Numerics TS
                          • Coroutine/Coroutine2 → Coroutines TS

                          MPL 的很大一部分可以使用可变参数模板修剪或删除.词法转换的一些常见用例可以替换为std::to_string 和 std::stoX.

                          A large part of MPL can be trimmed down or removed using variadic templates. Some common use cases of Lexical cast can be replaced by std::to_string and std::stoX.

                          一些 Boost 库与 C++11 相关,但也有更多的扩展,例如Boost.Functional/Hash 包含 hash_combine 以及 C++11 中未找到的相关函数,Boost.Chrono 具有 I/O 和舍入以及许多其他时钟等,因此您可能仍想在真正关闭它们之前查看一下 boost .

                          Some Boost libraries are related to C++11 but also have some more extensions, e.g. Boost.Functional/Hash contains hash_combine and related functions not found in C++11, Boost.Chrono has I/O and rounding and many other clocks, etc. so you may still want to take a look at the boost ones before really dismissing them.

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