These options will be used on objects of class 'GuideLegend'.
opts_GuideLegend(constructor = c("guide_legend", "next"), ...)An object of class <constructive_options/constructive_options_GuideLegend>
Depending on constructor, we construct the object as follows:
"guide_legend" (default): We build the object using ggplot2::guide_legend().
"next" : Use the constructor for the next supported class.