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std::chrono::duration::operator-

Std：：Time：：工期：运算符+%28一元%29，std：：timeo：：time：：Operator-%28一元%29

​(1)​
constexpr duration operator+() const;(until C++17)
constexpr std::common_type_t<duration> operator+() const;(since C++17)
​(2)​
constexpr duration operator-() const;(until C++17)
constexpr std::common_type_t<duration> operator-() const;(since C++17)

为持续时间实现一元加和一元减。

如果rep_是一个成员变量，该变量保存持续时间对象中的滴答数，以及D是返回类型，

1%29相当于return D(*this

2%29相当于return D(-rep_

参数

%280%29

返回值

1%29此工期对象的副本

2%29这个持续时间对象的副本，并否定了滴答数。

例

二次

#include <chrono>
#include <iostream>
 
int main()
{
    std::chrono::seconds s1(10
    std::chrono::seconds s2 = -s1;
 
    std::cout << "negated 10 seconds are " << s2.count() << " seconds\n";
}

二次

产出：

二次

negated 10 seconds are -10 seconds

二次

另见

operator++operator++(int)operator--operator--(int)increments or decrements the tick count (public member function)
operator+operator-operator*operator/operator%implements arithmetic operations with durations as arguments (function template)

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