core/org.jetbrains.kotlinx.dataframe.api/ensureIsFrameColumn

ensureIsFrameColumn

internal fun <C> SingleColumn<DataFrame<C>>.ensureIsFrameColumn(): SingleColumn<DataFrame<C>>

internal fun <C> ColumnAccessor<DataFrame<C>>.ensureIsFrameColumn(): ColumnAccessor<DataFrame<C>>

Checks the validity of this SingleColumn, by adding a check to see it's a FrameColumn (so, a SingleColumn<*>) and throwing an IllegalArgumentException if it's not.