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How to create a UStruct from scratch

here is the link for USTRUCT creation.

but it works when i put the USTRUCT in a generated head file only.
for example:

#include “Class.h”
USTRUCT(BlueprintType)
struct FCraftBy
{
GENERATED_USTRUCT_BODY()
};

if i put FCraftBy in a head file that created by myself, then i got compiler errors.

Catch simple struct example. Hope it helps you

LessonOct21Struct.h



#pragma once
#include "LessonOct21Struct.generated.h"

USTRUCT(BlueprintType)
struct FLessonOct21Struct
{
	GENERATED_USTRUCT_BODY()
public:
	FLessonOct21Struct();
	FLessonOct21Struct(float x, float y, float z);

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Test Struct")
		float MyX;
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Test Struct")
		float MyY;
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Test Struct")
		float MyZ;
	static FLessonOct21Struct Add(FLessonOct21Struct A, FLessonOct21Struct B);
};


LessonOct21Struct.cpp


#include "DML_UE4_Course.h"
#include "LessonOct21Struct.h"

FLessonOct21Struct::FLessonOct21Struct()
{
	MyX = 0.0f;
	MyY = 0.0f;
	MyZ = 0.0f;
}
FLessonOct21Struct::FLessonOct21Struct(float x, float y, float z)
{
	MyX = x;
	MyY = y;
	MyZ = z;
}

FLessonOct21Struct FLessonOct21Struct::Add(FLessonOct21Struct A, FLessonOct21Struct B)
{
	return FLessonOct21Struct(A.MyX + B.MyX, A.MyY + B.MyY, A.MyZ + B.MyZ);
}