ZeroFieldOperator

ZeroFieldOperator is a base class for operators that take no input. The main use case is the CountOperator, which counts the occurrences of each unique key. Other uses are possible, for example, weighted random number assignment.

The primary rationale for ZeroFieldOperator and ZeroFieldCalculator is to clarify the information available to such a routine. In particular, the split fields passed to processHeaderLine and processNextLine don't include all fields in the input, something that might not be obvious when implementing an operator. (Only fields required by operators acting on specific fields are included.)

class ZeroFieldOperator : Operator {

import std.typecons : Flag;;

this(string operatorName);

void setCustomHeader(string customHeader);

bool allowCustomHeader();

string name();

string header();

void processHeaderLine(char[][] fields);

size_t[] numericFieldsToSave();

size_t[] textFieldsToSave();

ZeroFieldCalculator makeCalculator();

}

Constructors

this this(string operatorName): Undocumented in source.

Members

Functions

allowCustomHeader bool allowCustomHeader(): Undocumented in source. Be warned that the author may not have intended to support it.
header string header(): Undocumented in source. Be warned that the author may not have intended to support it.
makeCalculator ZeroFieldCalculator makeCalculator(): Undocumented in source.
name string name(): Undocumented in source. Be warned that the author may not have intended to support it.
numericFieldsToSave size_t[] numericFieldsToSave(): Undocumented in source. Be warned that the author may not have intended to support it.
processHeaderLine void processHeaderLine(char[][] fields): Undocumented in source. Be warned that the author may not have intended to support it.
setCustomHeader void setCustomHeader(string customHeader): Undocumented in source. Be warned that the author may not have intended to support it.
textFieldsToSave size_t[] textFieldsToSave(): Undocumented in source. Be warned that the author may not have intended to support it.

Inherited Members

From Operator

header string header [@property getter]: Undocumented in source.
name string name [@property getter]: Undocumented in source.
processHeaderLine void processHeaderLine(char[][] fields): Undocumented in source.
numericFieldsToSave size_t[] numericFieldsToSave(): Undocumented in source.
textFieldsToSave size_t[] textFieldsToSave(): Undocumented in source.
makeCalculator Calculator makeCalculator(): Undocumented in source.