Question

I have the following structure

typedef struct _LSHFunctionT 
{
    double *a;
    double b;
} LSHFunctionT, *PLSHFunctionT;

My question is; is there a difference between these two declarations

PLSHFunctionT myPointer1;

and

LSHFunctionT *myPointer2;

and if not, then why do people explicitly use two of them (LSHFunctionT and *PLSHFunctionT). Why not just use LSHFunctionT.

Does it go the same way for the following two declarations

PLSHFunctionT *myPointer3;

and

LSHFunctionT **myPointer3;

Answer 1

typedef struct _LSHFunctionT 
{
    double *a;
    double b;
} LSHFunctionT, *PLSHFunctionT;

Yes, PLSHFunctionT x; is equal to LSHFunctionT* x;

And yes, PLSHFunctionT* x; is equal to LSHFunctionT** x;

The purpose of typedef is to assign new names to existing types. You can define typedef int lol; and declare variable lol i;, but compiler will consider it int anyway.

You should also check these questions:
When should I use typedef in C++?
Why should structure names have a typedef?

Hope this helps.