Program termination The following functions manage program termination and resource cleanup.

explicit operator bool() const;

Defined in header

std::shared_ptr<T> lock() const;

Defined in header

std::string message() const;

static T round_error();

static const bool is_bounded;

static std::chrono::system_clock::time_point from_time_t( std::time_t

static std::chrono::time_point<std::chrono::steady_clock> now();