\name{gg_dep}
\alias{gg_dep}
\title{Give a deprecation error, warning, or messsage, depending on version number.}
\usage{
  gg_dep(version, msg)
}
\arguments{
  \item{version}{The last version of ggplot2 where this
  function was good (in other words, the last version where
  it was not deprecated).}

  \item{msg}{The message to print.}
}
\description{
  Version numbers have the format
  <major>.<minor>.<subminor>, like 0.9.2. This function
  compares the current version number of ggplot2 against
  the specified \code{version}, which is the most recent
  version before the function (or other object) was
  deprecated.
}
\details{
  \code{gg_dep} will give an error, warning, or message,
  depending on the difference between the current ggplot2
  version and the specified \code{version}.

  If the current major number is greater than
  \code{version}'s major number, or if the current minor
  number is more than 1 greater than \code{version}'s minor
  number, give an error.

  If the current minor number differs from \code{version}'s
  minor number by one, give a warning.

  If the current subminor number differs from
  \code{version}'s subminor number, print a message.
}

