Declared directly before whatever the macro is referencing, they may left blank or filled in with in with varying specifiers and metadata. Essentially, using these macros helps to greatly simplify the process of declaring things such as classes, structures, interfaces, functions, and properties within gameplay classes.
Unreal engine 4. code#
Some of the more important basic ones include:įor those that have a good grasp on how general code structures work in C++, these structures work almost identically aside from a few minor additions. Macros can be found in many places within code. The remaining three are standards that Epic has set forth in order to ensure written code will stay consistent.
The engine will automatically add prefixes to classes that inherit from Object, Actor, and Widget when created. Most other classes are typically prefixed with the letter F.Abstract interface classes are prefixed with the letter I.Classes inheriting from SWidget are prefixed with the letter S.Classes inheriting from AActor are prefixed with the letter A.Classes inheriting from UObject are prefixed with the letter U.Template classes are prefixed with the letter T.If you go into the editor and add a new class in, you will occasionally find that a letter was added to the beginning of the class name due to Epic’s coding standard. One of the many things that can catch your attention are the letters prefixing class names. If it’s in monolithic mode, it will be declared as empty. In DLL modes, the #define will be declared as either a DLL import ( _declspec (dllimport )) if there’s another module that is being compiled and depends on the current module, or DLL export ( _declspec (dllexport )) if the current module is being compiled. At compile time, one of three things will occur with said #define. This is because it’s actually defined on the command line by the Unreal Build Tool. If you attempt to go to its definition however, an error should occur as Visual Studios cannot find the #define in a source code file. If you hover over it, you’ll notice that it’s actually a #define. Within some of the class declarations, it’s quite common to find a PROJECTNAME_API. Only those that are created in the engine by the Add Code to Project button under the File menu will receive one as long as a base class is specified. Once the changes are made, recompile the code so that the Unreal Build Tool can modify the file as needed. Instead, changes to the corresponding header file should be made. generated files states, these files should not be manually changed. Note that just like the header comment at the top of each. generated file is a boilerplate that the tool will create.
generated files are separate files that Epic’s Unreal Build Tool will create and link to your class by including it within the header file. These are some of the more basic API things that every person that wants to code in the engine should know and understand before they dive into making games. UCLASS( ), UPROPERTY( ), GENERATED_BODY( ) )
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