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The inherited without an explicit name can be a bit confusing: if the extended type has an ancestor the compiler searches in the helper for the ancestor of the extended type (if available), then in the ancestor of the extended type (if available), and so forth. The inherited FuncName skips the ancestors of the helper and starts searching in the extended type, then it proceeds normally, i.e. Please note that if there is a helper for an ancestor it is searched right before the ancestor class itself is searched. and then (for class helpers) in the ancestors of the extended class.then in the extended type (helper for),.
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first searched in all the ancestor helpers of the current helper.If a method is not defined in the helper type itself it is TObject in case of a helper declared as class helper for TObject). First of the type of Self is always of the type of the extended type (e.g. The rules when implementing a helper are a bit differently then when implementing a normal class or record. For type helpers the modeswitch typehelpers is required. In mode ObjFPC record helpers need the modeswitch advancedrecords to be declared in mode Delphi no further modeswitch is necessary. The declarations inside a helper are very similiar to the declaration of a normal class, but you must not use fields, destructors and class constructors/destructors. For record helpers TypeName must be a record and BaseHelper must be a record helper that extend the same record type. In case of a class helper TypeName must be a class and BaseHelper must be another class helper that extends either the same class as TypeName or a parent class of it. HelperName, BaseHelper and TypeName have to be valid Pascal identifiers. The inheritance (BaseHelper) is optional. The sequence class helper declares a helper for a class, record helper declares a helper for a record while type helper declares a helper for a primitive type. HelperName = class|record|type helper for TypeName The general syntax for helper types is the following: Additionally, they can extend interfaces, ( type helper) which is functionality unique to FPC. constructors, class constructors, class destructors.Ĭurrently helper types can be used to extend classes ( class helper), records ( record helper) and (primitive) types ( type helper) as those are supported by Delphi as well.Helper types (which are not themselves concrete types of any kind despite appearing as such, and in fact amount to "syntactic sugar") allow you to extend a given class, interface, record or primitive type with additional functionality. 4.1 Differences between mode Delphi and ObjFPCĬlass and Record helpers are available since the release of FPC 2.6, Type helpers since the release of FPC 3.0.If you’re looking for a kayak for the older members of the family as well, make sure you view the rest of the Bluewave kayak collection and find the right kayak for your needs and capabilities. Options such as these allow children who are too young to paddle by themselves time to experience and get used to being on the water. While these kayaks are both great options for children and teenagers, there are also tandem kayaks such as the Convoy kayaks available for those who would like to head out together with a small child fitting in the kayak in-between two adults. Both of these single kayaks are ideal for the younger audiences, and provide designs for easy manoeuvrability and handling. For younger paddlers, the Manta Junior kayak is the perfect child kayak, with it’s extremely stable design and load capacity of up to 60kg. The Discovery Kayaks are great investments and are the perfect all round kayaks for learning, touring and paddling for the whole family. The Discovery Kayak even features fishing rod holders for budding fishermen. Able to carry up to 150kg, this kayak can support kids aged 12+ all the way into adulthood, making it a great choice as the child grows and develops. This hardy kayak is the perfect long term investment as it is a great floatation device for recreational paddling at any level. The Discovery Kayak makes a perfect kids kayak as it is very stable and easy to use. Kayaks such as the Discovery provides the perfect kayak for beginners, making it a great option for older kids and teenagers starting out. Looking to get out onto the water this summer? This range of junior kayaks is perfect for making sure the entire family can get active and outdoors.