Question

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What is the meaning of double curly braces initializing a C-struct ?

for this following structure,

typedef struct matrix
{
    float data[16];
} matrix;

Is there any difference between,

matrix test1 = {0};

and

matrix test1 = { { 0 } };

when it comes to initializing the data member of the structure. Both initializes data to zero.

Some insight when it comes to C or C++, would be great.

Answer 1

With matrix test1 = { 0 } you will initialize test1 with all zero’s and with matrix test1 = { { 0 } } You will initialize test1.data. with all zero’s in this case it does the same actually since you don’t have any other data definitions in your struct 🙂