Argument Class Reference

A mathematical function argument definition with free value and base class for all argument definitions. More...

`#include <Function.h>`

Inheritance diagram for Argument:

## Public Member Functions

| Argument (string name_="", bool does_test=true, bool does_error=true)
| Argument (const Argument *arg)
virtual | ~Argument ()
virtual void | set (const Argument *arg)
virtual Argument * | copy () const
virtual string | print () const
string | printlong () const
bool | test (MathStructure &value, int index, MathFunction *f, const EvaluationOptions &eo=default_evaluation_options) const
virtual MathStructure | parse (const string &str, const ParseOptions &po=default_parse_options) const
virtual void | parse (MathStructure *mstruct, const string &str, const ParseOptions &po=default_parse_options) const
string | name () const
void | setName (string name_)
void | setCustomCondition (string condition)
string | getCustomCondition () const
bool | tests () const
void | setTests (bool does_error)
bool | alerts () const
void | setAlerts (bool does_error)
bool | zeroForbidden () const
void | setZeroForbidden (bool forbid_zero)
bool | matrixAllowed () const
void | setMatrixAllowed (bool allow_matrix)
bool | handlesVector () const
void | setHandleVector (bool handle_vector)
bool | isLastArgument () const
void | setIsLastArgument (bool is_last)
bool | rationalPolynomial () const
void | setRationalPolynomial (bool rational_polynomial)
virtual bool | suggestsQuotes () const
virtual int | type () const

## Protected Member Functions

virtual bool | subtest (MathStructure &value, const EvaluationOptions &eo) const
virtual string | subprintlong () const

## Protected Attributes

string | sname
string | scondition
bool | b_zero
bool | b_test
bool | b_matrix
bool | b_text
bool | b_error
bool | b_rational
bool | b_last
bool | b_handle_vector

## Detailed Description

A mathematical function argument definition with free value and base class for all argument definitions.

Free arguments accepts any value.

## Constructor & Destructor Documentation

## Argument() [1/2]

Argument::Argument | ( | string | name_ = `""`,
|  | bool | does_test = `true`,
|  | bool | does_error = `true`
| ) |  |

Creates a new argument definition.

Parameters

  name | Name/title of the argument definition.
  does_test | If argument values will be tested.
  does_error | If an error will issued if the value tests false.

## Argument() [2/2]

Argument::Argument | ( | const Argument * | arg | ) |

Creates a copy of an argument definition.

Parameters

  arg | Argument to copy.

## ~Argument()

virtual Argument::~Argument | ( |  | ) |

virtual

Destructor

## Member Function Documentation

## alerts()

bool Argument::alerts | ( |  | ) | const

If an error message will be presented to the user if the value for the argument is not allowed.

Returns
  true if error messages will be shown.

## copy()

virtual Argument* Argument::copy | ( |  | ) | const

virtual

Returns a copy of the argument definition.

Returns
  A copy.

Reimplemented in ArgumentSet, FileArgument, VariableArgument, AngleArgument, UnitArgument, BooleanArgument, FunctionArgument, ExpressionItemArgument, MatrixArgument, VectorArgument, DateArgument, TextArgument, SymbolicArgument, IntegerArgument, NumberArgument, DataObjectArgument, and DataPropertyArgument.

## getCustomCondition()

string Argument::getCustomCondition | ( |  | ) | const

Returns the custom condition expression set for argument values.

Returns
  Custom condition for argument values.

## name()

string Argument::name | ( |  | ) | const

Returns the name/title of the argument definition.

Returns
  Name/title.

## parse() [1/2]

virtual MathStructure Argument::parse | ( | const string & | str,
|  | const ParseOptions & | po = `default_parse_options`
| ) |  | const

virtual

Parses an expression for an argument value. The default behavior is to use Calculator::parse() directly.

Parameters

  str | Expression.
  po | Parse options.

Returns
  A new mathematical structure with the parsed expression.

## parse() [2/2]

virtual void Argument::parse | ( | MathStructure * | mstruct,
|  | const string & | str,
|  | const ParseOptions & | po = `default_parse_options`
| ) |  | const

virtual

Parses an expression for an argument value. The default behavior is to use Calculator::parse() directly.

Parameters

  mstruct | Mathematical structure to set with the parsed expression.
  str | Expression.
  po | Parse options.

Reimplemented in AngleArgument, and DateArgument.

## print()

virtual string Argument::print | ( |  | ) | const

virtual

Resturns a short description of the argument definition. Ex. "number" for NumberArgument.

Returns
  Short description.

Reimplemented in ArgumentSet, FileArgument, VariableArgument, AngleArgument, UnitArgument, BooleanArgument, FunctionArgument, ExpressionItemArgument, MatrixArgument, VectorArgument, DateArgument, TextArgument, SymbolicArgument, IntegerArgument, NumberArgument, DataObjectArgument, and DataPropertyArgument.

## printlong()

string Argument::printlong | ( |  | ) | const

Resturns a long description of the argument definition. Ex. "A real number > 2".

Returns
  Long description.

## rationalPolynomial()

bool Argument::rationalPolynomial | ( |  | ) | const

If only rational polynomials are allowed as argument value.

See also
  MathStructure::isRationalPolynomial()

Returns
  true if only rational polynomials is allowed.

## set()

virtual void Argument::set | ( | const Argument * | arg | ) |

virtual

Sets the argument to a copy of an argument definition.

Parameters

  arg | Argument to copy.

Reimplemented in IntegerArgument, and NumberArgument.

## setCustomCondition()

void Argument::setCustomCondition | ( | string | condition | ) |

Sets a custom condition for argument values. '\x' is replaced by the argument value in the expression.

Parameters

  condition | Condition expression.

## setName()

void Argument::setName | ( | string | name_ | ) |

Sets the name/title of the argument definition.

Parameters

  name_ | New name/title.

## setZeroForbidden()

void Argument::setZeroForbidden | ( | bool | forbid_zero | ) |

Sets if a value of zero is forbidden for the argument value.

Parameters

  forbid_zero | If zero shall be forbidden.

## subprintlong()

virtual string Argument::subprintlong | ( |  | ) | const

protected virtual

This function is called from Argument::printlong() and returns description specific the argument definition type. Should be reimplemented by all subclasses. For example IntegerArgument::subprintlong() might return "an integer" and Argument::printlong() might append " that fulfills the condition: even(\x)".

Returns
  Long description.

Reimplemented in ArgumentSet, FileArgument, VariableArgument, AngleArgument, UnitArgument, BooleanArgument, FunctionArgument, ExpressionItemArgument, MatrixArgument, VectorArgument, DateArgument, TextArgument, SymbolicArgument, IntegerArgument, NumberArgument, DataObjectArgument, and DataPropertyArgument.

## subtest()

virtual bool Argument::subtest | ( | MathStructure & | value,
|  | const EvaluationOptions & | eo
| ) |  | const

protected virtual

This function is called from Argument::test() and performs validation specific to the argument definition type. Should be reimplemented by all subclasses.

Parameters

  value | Value to test.
  eo | Evaluation options to use if the value needs to be evaluated.

Returns
  true if the value is valid for the argument definition.

Reimplemented in ArgumentSet, FileArgument, VariableArgument, AngleArgument, UnitArgument, BooleanArgument, FunctionArgument, ExpressionItemArgument, MatrixArgument, VectorArgument, DateArgument, TextArgument, SymbolicArgument, IntegerArgument, NumberArgument, DataObjectArgument, and DataPropertyArgument.

## test()

bool Argument::test | ( | MathStructure & | value,
|  | int | index,
|  | MathFunction * | f,
|  | const EvaluationOptions & | eo = `default_evaluation_options`
| ) |  | const

Tests if a value fulfils the requirements of the argument definition. The value might change if it has not been fully evaluated.

Parameters

  value | Value to test.
  f | Mathematical function that the value is an argument for.
  eo | Evaluation options to use if the value needs to be evaluated.

Returns
  true if the value is valid for the argument definition.

## tests()

bool Argument::tests | ( |  | ) | const

If the value for the argument will be tested. If not, the argument only works as an suggestion and any value is allowed.

Returns
  true if the argument value will be tested.

## type()

virtual int Argument::type | ( |  | ) | const

virtual

Returns the type of the argument, corresponding to which subclass the object belongs to.

Returns
  ArgumentType.

Reimplemented in ArgumentSet, FileArgument, VariableArgument, AngleArgument, UnitArgument, BooleanArgument, FunctionArgument, ExpressionItemArgument, MatrixArgument, VectorArgument, DateArgument, TextArgument, SymbolicArgument, IntegerArgument, NumberArgument, DataObjectArgument, and DataPropertyArgument.

## zeroForbidden()

bool Argument::zeroForbidden | ( |  | ) | const

If an argument value of zero is forbidden.

Returns
  true if zero argument value is forbidden.

The documentation for this class was generated from the following file:

- libqalculate/Function.h