Adding a global macro in C++

Development Programming & Scripting
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1

Hi everyone!

I’m looking to create a global function-like macro which would be available in all of my source files.

The idea for the macro would be that it handles null checking and logging, so instead of having something like…

void foo()
{
    if (ObjectPtr == nullptr)
    {
        UE_LOG(...);
        return;
    }
    DoSomethingWith(ObjectPtr);
}

… I might be able to replace it with something that looks like this…

void foo()
{
    REQUIRES(ObjectPtr);
    DoSomethingWith(ObjectPtr);
}

The objective of this is to be able to avoid having to include it into every single file, otherwise I would just make a class out of it, or just leave it as it is for now. I’m mainly just interested if it’s something that’s possible to do.

I suspect that I should be adding the macro definition in MyProject.Build.cs using something like

PrivateDefinitions.Add(MYMACRO);

This seems to work just fine for variable macros like if for some reason I wanted to redefine pi

PrivateDefinitions.Add("PI=3.14");

But I’m confused how to do this for a function-like macro.

It’s probably a bad idea to be even doing this in the first place, but I want to know if it can be done!