Default Constructor Constraint

There is another possible generic type constraint, called default constructor or parameterless constructor. If you need to invoke the default constructor to create new object of the generic type (for example for filling a list) you can use this constraint. In theory (and according to the documentation), the compiler should let you use it only for those types with a default constructor. In practice, if a default constructor doesn't exists, the compiler will let it go and call the default constructor of TObject.

A generic class with a constructor constraint can be written as follows76 (this one is extracted by the IntfConstraint example): type

TConstrClass <T: class, constructor> = class private val: T; publ ic constructor Create; function Get: T;

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Project Management Made Easy

Project Management Made Easy

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