There are few coding standards and conventions are provided by Epic Games for UE4 code.
Unfortunately, default Visual Studio formatter doesn't know anything about it. Just press Ctrl+K / Ctrl+D and you'll see:
It's not cool. Just not cool.
But fortunately, it's easy to instruct the formatter to work right. Just create the .clang-format file and place it into the Source folder of your project with following content:
--- Language: Cpp BasedOnStyle: LLVM IndentWidth: 4 TabWidth: 4 UseTab: Always Standard: Cpp11 AccessModifierOffset: -4 AlignAfterOpenBracket: DontAlign AlignEscapedNewlines: Right AlignTrailingComments: true AllowShortCaseLabelsOnASingleLine: true AllowShortFunctionsOnASingleLine: InlineOnly BreakBeforeBraces: Allman BreakConstructorInitializersBeforeComma: true ColumnLimit: 0 PointerAlignment: Left SpacesInAngles: false --- Language: ObjC ...
After that, clang-format will do its job as it should, and your code for Unreal Engine 4 based game will look gorgeous.
P.S. - Instruction for Mac/XCode users is available by demand.