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operator==,!=,<,<=,>,>=(std::chrono::duration) 

template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator==(const duration<Rep1, Period1>& lhs,
                          const duration<Rep2, Period2>& rhs);
 (1) 
template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator!=(const duration<Rep1, Period1>& lhs,
                          const duration<Rep2, Period2>& rhs);
 (2) 
template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator<(const duration<Rep1, Period1>& lhs,
                         const duration<Rep2, Period2>& rhs);
 (3) 
template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator<=(const duration<Rep1, Period1>& lhs,
                          const duration<Rep2, Period2>& rhs);
 (4) 
template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator>(const duration<Rep1, Period1>& lhs,
                         const duration<Rep2, Period2>& rhs);
 (5) 
template <class Rep1, class Period1, class Rep2, class Period2>
constexpr bool operator>=(const duration<Rep1, Period1>& lhs,
                          const duration<Rep2, Period2>& rhs);
 (6)

Compares two durations.

1-2) Checks if lhs and rhs are equal, i.e. the number of ticks for the type common to both durations are equal.

3-6) Compares lhs to rhs, i.e. compares the number of ticks for the type common to both durations.

Parameters

lhs - duration on the left-hand side of the operator
rhs - duration on the right-hand side of the operator

Return value

Assuming that CT =
std::common_type<std::chrono::duration<Rep1, Period1>,
std::chrono::duration<Rep2, Period2>>::type, then:

1) CT(lhs).count() == CT(rhs).count().

2) !(lhs == rhs).

3) CT(lhs).count() < CT(rhs).count().

4) !(rhs < lhs).

5) rhs < lhs.

6) !(lhs < rhs).

Example

#include <chrono>
#include <iostream>
int main()
{
    if(std::chrono::seconds(2) == std::chrono::milliseconds(2000))
        std::cout <<  "2 s == 2000 ms\n";
    else
        std::cout <<  "2 s != 2000 ms\n";
 
    if(std::chrono::seconds(61) > std::chrono::minutes(1))
        std::cout <<  "61 s > 1 min\n";
    else
        std::cout <<  "61 s <= 1 min\n";
 
}

Output:

2 s == 2000 ms
61 s > 1 min

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