Perform basic checks on a function argument.

checkArgument is a utility function that provides basic assurances about function argument values and generates standardised error messages when invalid values are encountered.

checkArgument(
  argumentCheckMode,
  checkDataTypes,
  className,
  methodName,
  argumentValue,
  isMissing,
  allowMissing = FALSE,
  allowNull = FALSE,
  allowedClasses = NULL,
  mustBeAtomic = FALSE,
  allowedListElementClasses = NULL,
  listElementsMustBeAtomic = FALSE,
  allowedValues = NULL,
  minValue = NULL,
  maxValue = NULL,
  maxLength = NULL
)

Arguments

argumentCheckMode

A number between 0 and 4 specifying the checks to perform.

checkDataTypes

A logical value specifying whether the data types should be checked when argumentCheckMode=3

className

The name of the calling class, for inclusion in error messages.

methodName

The name of the calling method, for inclusion in error messages.

argumentValue

The value to check.

isMissing

Whether the argument is missing in the calling function.

allowMissing

Whether missing values are permitted.

allowNull

Whether null values are permitted.

allowedClasses

The names of the allowed classes for argumentValue.

mustBeAtomic

Whether the argument value must be atomic.

allowedListElementClasses

For argument values that are lists(), the names of the allowed classes for the elements in the list.

listElementsMustBeAtomic

For argument values that are lists(), whether the list elements must be atomic.

allowedValues

For argument values that must be one value from a set list, the list of allowed values.

minValue

For numerical values, the lowest allowed value.

maxValue

For numerical values, the highest allowed value.

maxLength

For character values, the maximum allowed length (in characters) of the value.

Value

No return value. If invalid values are encountered, the

stop() function is used to interrupt execution.