Constructors

The Duration constructors allow clients to specify (1) no parameters, yielding a zero-length Duration, (2) days, (3) days and hours, (4) days, hours, and minutes, or (5) days hours, minutes, and seconds. For example:

       Duration d0;          //  zero-length Duration
       Duration d1(1);       //  Duration of 1d
       Duration d2(1,1);     //  Duration of 1d 1h
       Duration d3(1,1,1);   //  Duration of 1d 1h 1m
       Duration d4(1,1,1,1); //  Duration of 1d 1h 1m 1s

As usual, constructors may appear in expressions. Although addition has yet to be discussed, the following example illustrates such an expression:

       Duration d;
       ...
       d += Duration(1);  // add one day to d

The arguments to the Duration constructors may have mixed signs. Furthermore, hours may lie outside the range [0,23] and both minutes and seconds may lie outside the range [0,59]. Such ``unnormalized'' arguments are immediately normalized by the constructor, as illustrated by the following example:

       cout << Duration(-1,25,-61,61) << endl;

which prints

       0d 00h 00m 01s