How to get struct array (or pointer) that is part of another struct? in C

Question

In the following code:

typedef struct 
{
    uint32_t variable_1;
}struct_1;

typedef struct 
{
    uint32_t variable_2;
}struct_2;

typedef struct 
{
    struct_1 struct_1_var;
    struct_2 struct_2_var;
}struct_all;


struct_all variable_t[10];

struct_1* struct_1_var; //how to get this to point to an array of struct_1 that's inside variable_t?

Basically, I want to get an struct_1[10] or struct_2[10] that that is part of variable_t[10].

Scott Hunter · Accepted Answer · 2019-12-07 16:06:12Z

4

You can't, because there isn't an array of either struct_1s or struct_2s in variable_t to point to. There is an array of elements, each of which has a struct_1 and a struct_2.

If you want an array of just one type of the other of the values in variable_t, you'll need to copy them out one at a time into a new array.

answered Dec 7, 2019 at 16:06

Scott Hunter

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1 Comment

Luis Carlos Over a year ago

That is what I was afraid of. Thought that there was a way to do it without one at a time. Thanks!

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