Type aliases

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Help / WLanguage / WLanguage syntax / Declaring variables

Declaration of type aliases

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Type aliases

A "type alias" is a redefinition of an existing type. This alias can be used as a standard WLanguage variable type.

Example

// Exemple 1: Déclaration d'alias de type
// -- Initialisation du projet
PrixPoudre is type: numeric (5,4)
// PrixPoudre est un nouvel alias de type Numérique avec: 
// 5 chiffres pour la partie entière
// 4 chiffres pour la partie décimale

// Exemple 2: Déclaration, initialisation et utilisation des alias de type
// -- Initialisation du projet
Prix is type: currency
PrixHorsTaxes is type: currency
TauxTVA is type: numeric

// Clic sur BTN_Calcul
PrixHT_Voiture is PrixHorsTaxe = 625000
TauxTVA_Voiture is TauxTVA = 20
FraisDouane_Voiture is Prix = 62500
PrixTotal is Prix = CalculeTarif(PrixHT_Voiture, TauxTVA_Voiture, FraisDouane_Voiture)

PROCEDURE CalculeTarif(MonPrix is PrixHorsTaxes, mTauxTVA is TauxTVA, FraisDouane is Prix):Prix
PrixTTC is Prix = MonPrix + mTauxTVA * MonPrix/100) + FraisDouane
RETURN PrixTTC

Syntax

Declaring a type alias Hide the details

<Nom de l'alias> est type: <Type de l'alias>
END

<Alias name>:

Name of new type to be defined.

<Alias type>:

Type of variable corresponding to the alias.

Declaring a variable using a type alias Hide the details

<Variable name>:

Name of the variable to declare.

<Alias name>:

Name of a previously declared alias.

Remarks

Declaration of type aliases

Type aliases must be declared in:

The project initialization code so that it can be used in all the WLanguage events of the project (code of the project, windows, controls, procedures, etc.).
The global declaration code of a window so that it can be used in all the WLanguage events of the window (code of the window, controls in the window, local procedures, etc.).
The opening code of a report so that it can be used in all the WLanguage events of the report (code of the report, controls in the report, local procedures, etc.).
The class declaration code so that it can be used in the class.
The declaration code of a set of procedures so that it can be used in all the procedures of the set.

Remarque: A type alias is always global:

to a project,
to a window,
to a report,
to a class.