CODEWITHSUNDEEP
arrayscpointersstructurestatic-initialization
Arkaik
Arkaik

Reputation: 902

Static initialization of int array from within structure initialization

I'm trying to statically declare and initialize a structure array containing both char and int arrays.

The following example works well.

typedef struct myStruct
{
    char* name;
    uint8_t size;
    uint8_t *value;
}myStruct;

uint8_t struct1_value[] = {0x00, 0x01};
uint8_t struct2_value[] = {0x00, 0x01, 0x03, 0x04};

myStruct myStructArray[] = {
    [0] = {
        .name = "Struct_1",
        .size = 2,
        .value = struct1_value,
    },
    [1] = {
        .name = "Struct_2",
        .size = 4,
        .value = struct2_value,
    },
};

I can't find a syntax that allows to initialize value field directly from myStructArray

I would like to know if there is a way to initialize the value field without having to declare struct1_value and struct2_value variables.

Maybe it's just not possible in pure C but as it's possible to statically initialize a char array, why not with a int array ?

Upvotes: 0

Views: 51

Answers (2)

MikeCAT
MikeCAT

Reputation: 75062

You can use compound literals.

myStruct myStructArray[] = {
    [0] = {
        .name = "Struct_1",
        .size = 2,
        .value = (uint8_t[]){0x00, 0x01},
    },
    [1] = {
        .name = "Struct_2",
        .size = 4,
        .value = (uint8_t[]){0x00, 0x01, 0x03, 0x04},
    },
};

Upvotes: 2

JDługosz
JDługosz

Reputation: 5642

value is not an array, but a pointer. You must initialize it by referring to the array that exists elsewhere.

Indeed name works differently because the lexical literal syntax for strings "like this" create an unnamed array of chars.

Upvotes: 0

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