function using a pointer to a pointer with a structure

Question

I have a function using a pointer to a pointer to a structure:

int function(struct_A ** mystructA);

It worked when i used it with my declared struct:

struct_A *mystructA;
function(&mystructA);

however, impossible to use my structure throught another structure:

struct struct_B{
    struct_A *mystructA;
}

struct_B mystructB;
function( (&mystructB)->mystructA );    //this line cause me a segfault

I am struggling here, any idea where it could come from?

if you want to use it this strange way function( &(&mystructB)->mystructA ); — 0___________
– 0___________, Commented Oct 14, 2020 at 17:36

0___________ · Accepted Answer · 2020-10-14 17:37:58Z

1

struct struct_B{
    struct_A *mystructA;
}

struct struct_B mystructB;
struct struct_B *mystructBptr;

/* .... */

function( &mystructB.mystructA );
function( &(&mystructB) -> mystructA );
function( &mystructBptr -> mystructA );

answered Oct 14, 2020 at 17:37

0___________

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Comments

Vlad from Moscow · Accepted Answer · 2020-10-14 17:17:19Z

1

It seems you mean the following

struct struct_B{
    struct_A *mystructA;
}

struct struct_B mystructB;
function( &mystructB.mystructA );

edited Oct 14, 2020 at 17:17

answered Oct 14, 2020 at 17:11

Vlad from Moscow

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