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README

NAME
    "Time::HiRes::Value" - a class representing a time value or interval in
    exact microseconds

DESCRIPTION
    The "Time::HiRes" module allows perl to access the system's clock to
    microsecond accuracy. However, floating point numbers are not suitable
    for manipulating such time values, as rounding errors creep in to
    calculations performed on floating-point representations of UNIX time.
    This class provides a solution to this problem, by storing the seconds
    and miliseconds in separate integer values, in an array. In this way,
    the value can remain exact, and no rounding errors result.

FUNCTIONS
  $time = Time::HiRes::Value->new( $sec, $usec )
    This function returns a new instance of a "Time::HiRes::Value" object.
    This object is immutable, and represents the time passed in to the
    "*$sec*" and "*$usec*" parameters.

    If the "*$usec*" value is provided then the new "Time::HiRes::Value"
    object will store the values passed directly, which must both be
    integers. Negative values are represented in "additive" form; that is, a
    value of -1.5 seconds would be represented by

     Time::HiRes::Value->new( -2, 500000 );

    If the "*$usec*" value is not provided, then the "*$sec*" value will be
    parsed as a decimal string, attempting to match out a decimal point to
    split seconds and microseconds. This method avoids rounding errors
    introduced by floating-point maths.

  $time = Time::HiRes::Value->now()
    This function returns a new instance of "Time::HiRes::Value" containing
    the current system time, as returned by the system's "gettimeofday()"
    call.

OPERATORS
    Each of the methods here overloads an operator

  $self->STRING()
  "$self"
    This method returns a string representation of the time, in the form of
    a decimal string with 6 decimal places. For example

     15.000000
     -3.000000
      4.235996

    A leading "-" sign will be printed if the stored time is negative, and
    the "*$usec*" part will always contain 6 digits.

  $self->add( $other )
  $self->sum( $other )
  $self + $other
    This method returns a new "Time::HiRes::Value" value, containing the sum
    of the passed values. If a string is passed, it will be parsed according
    to the same rules as for the "new()" constructor.

    Note that "sum" is provided as an alias to "add".

  $self->sub( $other )
  $self->diff( $other )
  $self - $other
    This method returns a new "Time::HiRes::Value" value, containing the
    difference of the passed values. If a string is passed, it will be
    parsed according to the same rules as for the "new()" constructor.

    Note that "diff" is provided as an alias to "sub".

  $self->mult( $other )
  $self * $other
    This method returns a new "Time::HiRes::Value" value, containing the
    product of the passed values. $other must not itself be a
    "Time::HiRes::Value" object; it is an error to attempt to multiply two
    times together.

  $self->div( $other )
  $self / $other
    This method returns a new "Time::HiRes::Value" value, containing the
    quotient of the passed values. $other must not itself be a
    "Time::HiRes::Value" object; it is an error for a time to be used as a
    divisor.

  $self->cmp( $other )
  $self <=> $other
    This method compares the two passed values, and returns a number that is
    positive, negative or zero, as per the usual rules for the "<=>"
    operator. If a string is passed, it will be parsed according to the same
    rules as for the "new()" constructor.

SEE ALSO
    *   Time::HiRes - Obtain system timers in resolution greater than 1
        second

AUTHOR
    Paul Evans <leonerd@leonerd.org.uk>

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