The Wiert Corner - irregular stream of stuff: jpluimers

Years after Allen Bauer and a few others wrote about Delphi MultiCast events, the Spring4D framework now supports MultiCast events on 3 platforms:

• Win32
• Win64
• Mac OS x86

Depending on the platform, the minimum required Delphi version is this (the develop branch builds in Delphi XE6):

• Win32: Delphi 2010 and up.
• Win64: Delphi XE2 and up.
• MacOSX: Delphi XE2 and up.

There are plans for support on Mobile platforms, and Spring4D needs help with that:

• The Intel implementation is written in Assembly, and fast.
• The Arm compiler does not allow Assembly language for various reasons.

So there is a need for an ARM solution not based on assembly in the Delphi code, preferably as cross-platform as possible.Even when Embarcadero solves QC 101064: TRttiInvokableType.CreateImplementation, there might still be a need for a fast implementation (the x86 and x64 implementations are fast and with the growth of mobile, fast could be a big benefit). If you are interested in helping, or just lurking around:

• The current implementation of multi-cast events is in Spring.Events.pas.
• The unit-tests are in Spring.Tests.Base.pas.

Some background information about the articles by Allen Bauer, and people implementing multi-cast events themselves:

• The Oracle at Delphi » Multicast events using generics.
• The Oracle at Delphi » Multicast Events – the cleanup.
• The Oracle at Delphi » Multicast Events – the finale.
• delphi – Getting Allen Bauer’s TMulticastEvent working – Stack Overflow.
• Te Waka o Pascal · multicast events.
• Delphi VCL for Win32 – multiple event handlers – Stack Overflow.
• Delphi 7: very basic Implementing MultiCast Events for Win32 Delphi’s TDataset and TField Descendants.
• Limited to only TNofityEvent: Multicast Delegates (or Web-archived-version of Mulicast Delegates as codebot.org happens to be down every once in a while).

–jeroen