std::chrono::duration<Rep,Period>::operator++, std::chrono::duration<Rep,Period>::operator--

 

C++

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语言支持 类型支持（基本类型、 RTTI 、类型特征）     库功能特性测试宏 (C++20) 动态内存管理 程序工具 错误处理 协程支持 (C++20) 变参数函数 launder (C++17) initializer_list (C++11) source_location (C++20) 三路比较 (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20) is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

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time_point (C++11)	clock_time_conversion (C++20)	clock_cast (C++20)
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duration (C++11)
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parse (C++20)
C 风格日期和时间

 

std::chrono::duration

成员函数
duration::duration
duration::operator=
duration::count
duration::zero
duration::min
duration::max
duration::operator+duration::operator-
duration::operator++duration::operator--
duration::operator+=duration::operator-=duration::operator*=duration::operator/=duration::operator%=
非成员函数
operator+operator-operator*operator/operator% operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20 前)(C++20) operator<< (C++20)	duration_cast floor (C++17) ceil (C++17) round (C++17) abs (C++17) operator""h (C++14) operator""min (C++14) operator""s (C++14) operator""ms (C++14) operator""us (C++14) operator""ns (C++14) from_stream (C++20)
辅助类
common_type treat_as_floating_point duration_values formatter<std::chrono::duration> (C++20)

 

	(1)
duration& operator++();			(C++17 前)
constexpr duration& operator++();			(C++17 起)
		(2)
duration operator++(int);				(C++17 前)
constexpr duration operator++(int);				(C++17 起)
			(3)
duration& operator--();					(C++17 前)
constexpr duration& operator--();					(C++17 起)
				(4)
duration operator--(int);						(C++17 前)
constexpr duration operator--(int);						(C++17 起)

自增或自减此 duration 的计次数。

若 rep_ 是 duration 对象中保有计次数的成员变量，则

1) 等价于 ++rep_; return *this;

2) 等价于 return duration(rep_++)

3) 等价于 --rep_; return *this;

4) 等价于 return duration(rep_--);

参数

（无）

返回值

1,3) 到修改后的此 duration 的引用

2,4) 修改前所做的 duration 副本

示例

运行此代码

#include <chrono>
#include <iostream>
 
int main()
{
    std::chrono::hours h(1);
    std::chrono::minutes m = ++h;
    m--;
    std::cout << m.count() << " minutes\n";
}

输出：

119 minutes

参阅

operator+=operator-=operator*=operator/=operator%=	实现二个时长间的复合赋值 (公开成员函数)
operator+operator-operator*operator/operator% (C++11)	实现以时长为实参的算术运算 (函数模板)