template <class Rep2> constexpr explicit duration(const Rep2& r);
Remarks: This constructor shall not participate in overload resolution unless Rep2 is implicitly convertible to rep and
treat_as_floating_point<rep>::value is true or
treat_as_floating_point<Rep2>::value is false.
[ Example:
duration<int, milli> d(3); duration<int, milli> d(3.5);
— end example ]
Effects: Constructs an object of type duration.
Postcondition: count() == static_cast<rep>(r).
template <class Rep2, class Period2> constexpr duration(const duration<Rep2, Period2>& d);
Remarks: This constructor shall not participate in overload resolution unless no overflow is induced in the conversion and treat_as_floating_point<rep>::value is true or both ratio_divide<Period2, period>::den is 1 and treat_as_floating_point<Rep2>::value is false. [ Note: This requirement prevents implicit truncation error when converting between integral-based duration types. Such a construction could easily lead to confusion about the value of the duration. — end note ] [ Example:
duration<int, milli> ms(3); duration<int, micro> us = ms; duration<int, milli> ms2 = us;
— end example ]
Effects: Constructs an object of type duration, constructing rep_ from
duration_cast<duration>(d).count().
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