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[4.8] Why does DefaultInput.ini have +/- in front of its entries?

Why does DefaultInput.ini have +/- in front of its entries?

And why are there multiples of the exact same entry, where the only difference is a + or -?

Example:

 -AxisMappings=(AxisName="MoveForward",Key=W,Scale=1.000000)
 +AxisMappings=(AxisName="MoveForward",Key=W,Scale=1.000000)

I am setting up code to manually write in these values. I am assuming that I need to use GConfig->SetArray and pass in an array of strings, wherein the strings match the format. But I don't know why there are multiple entries of the same Value, or what the +/- do.

The Special Characters section in the Docs [link text]here[1] seems to say the +/- adds or removes a line if that property doesn't exist or is an exact match(respectively). But Im not following what that actually means.

If I am already writing a line into the .ini what exactly is the + adding?

[1]: https://docs.unrealengine.com/latest/INT/Programming/Basics/ConfigurationFiles/

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asked Aug 17 '16 at 11:21 PM in C++ Programming

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Erdrik
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Yes, its an old topic, but this is the answer (I had the same question today):

https://docs.unrealengine.com/en-US/Programming/Basics/ConfigurationFiles

 Special Characters
     + - Adds a line if that property does not exist yet (from a previous configuration file or earlier in the same configuration file).
    
     - - Removes a line (but it has to be an exact match).
    
     . - Adds a new property.
    
     ! - Removes a property; but you do not have to have an exact match, just the name of the property.
    
 
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answered Jul 13 '18 at 08:08 AM

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FloNrek
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