Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Retrieves the second component.
constexpr std::uint8_t second() const;
If this->valid() == true,
this value is within the [0, 59] range.
No-throw guarantee.