std::chrono:: hh_mm_ss

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C-style date and time

定义于头文件 `<chrono>`
template < class Duration > class hh_mm_ss ;		(C++20 起)

类模板 hh_mm_ss 将 std::chrono::duration 拆分为“分解后”的时间格式，例如小时 : 分钟 : 秒，其拆分精度由 Duration 模板参数决定。它主要是一个格式化工具。

Duration 必须是 std::chrono::duration 的特化类型，否则程序非良构。

Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Diagnostics library
Memory management library
Metaprogramming library (C++11)
General utilities library
Containers library
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Ranges library (C++20)
Algorithms library
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Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Technical specifications
Symbols index
External libraries

Member functions
hh_mm_ss::hh_mm_ss
hh_mm_ss::is_negative hh_mm_ss::hours hh_mm_ss::minutes hh_mm_ss::seconds hh_mm_ss::subseconds
hh_mm_ss::operator precision hh_mm_ss::to_duration
Non-member functions
operator<<
Helper classes
formatter <std::chrono::hh_mm_ss>

成员类型	定义
`precision`	std:: chrono :: duration < std:: common_type_t < Duration :: rep , std :: chrono :: seconds :: rep > , std:: ratio < 1 , 10 `^{fractional_width}` >>

(constructor)	构造 `hh_mm_ss` 对象 (公开成员函数)
is_negative hours minutes seconds subseconds	获取分解时间的组成部分 (公开成员函数)
operator precision to_duration	获取存储的 std::chrono::duration (公开成员函数)

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