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[4.8 Promoted] Extra parameters on BP callable functions not detected after hot-reload

When adding new parameters to functions on components which are "BlueprintCallable", existing BPs reference this function will fail to compile until the node is manually removed and re-added.

Steps to reproduce:

  • Start new project

  • Place empty actor in the level

  • Save the level and add a BP to this actor

  • Do File | Add new c++ class

  • Create new "ActorComponent" class with whatever name

  • In either X-Code or Visual Studio add a new function "void TestFunction(float value)" + it's implementation in the cpp

  • Build

  • Go back to the editor and observe the hot reload

  • Click on actor in scene

  • Add newly created c++ component onto this actor

  • Edit the actor's BP

  • Add a call to the components test function

  • Observe that the call function node has the correct "value" pin present

  • Go back to XCode or Visual Studio

  • Change function and implementation to be "void TestFunction(float value, float value2)"

  • Build

  • Go back to editor and wait for hot reload

  • Notice after the hot reload that the call function node still only has one parameter pin (value)

  • Expect to see "value2" pin appear

  • Click compile on BP

  • Note the compile error about the missing pin

  • Pin still does not appear

  • Delete the call function node

  • Add it back

  • Note the "value2" pin is now present


Product Version: Not Selected
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asked Apr 14 '15 at 12:11 PM in Bug Reports

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Hey TommyBear-

I was able to reproduce the BP node's input pins not updating after a hot reload. This has been reported (UE-13981) for further investigation.


Doug Wilson

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answered Apr 17 '15 at 04:12 PM

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