operator==,!=,<,<=,>,>=,<=>(std::chrono::duration)
constexpr bool operator==( const std::chrono::duration <Rep1, Period1>& lhs,
constexpr bool operator!=( const std::chrono::duration <Rep1, Period1>& lhs,
(until C++20)
constexpr bool operator<( const std::chrono::duration <Rep1, Period1>& lhs,
constexpr bool operator<=( const std::chrono::duration <Rep1, Period1>& lhs,
constexpr bool operator>( const std::chrono::duration <Rep1, Period1>& lhs,
constexpr bool operator>=( const std::chrono::duration <Rep1, Period1>& lhs,
requires std::three_way_comparable <std::common_type_t <Rep1, Rep2>>
constexpr auto operator<=>( const std::chrono::duration <Rep1, Period1>& lhs,
Compares two durations. Let CT
be std::common_type <std::chrono::duration <Rep1, Period1>, std::chrono::duration <Rep2, Period2>>::type:
The !=
operator is synthesized from operator==
.
[edit] Parameters
[edit] Return value
[edit] Example
#include <chrono> #include <iostream> int main() { constexpr auto t1 = std::chrono::seconds (2); constexpr auto t2 = std::chrono::milliseconds (2000); if constexpr (t1 == t2) std::cout << t1 << " == " << t2 << '\n'; else std::cout << t1 << " != " << t2 << '\n'; constexpr auto t3 = std::chrono::seconds (61); constexpr auto t4 = std::chrono::minutes (1); if constexpr (t3 > t4) std::cout << t3 << " > " << t4 << '\n'; else std::cout << t3 << " <= " << t4 << '\n'; using namespace std::chrono_literals; static_assert(1h == 60min); static_assert(1min == 60s); static_assert(1s == 1'000ms); static_assert(1ms == 1'000us); static_assert(1us == 1'000ns); }
Output:
2s == 2000ms 61s > 1min