Array of custom type - quick syntax query.

[aatwo]

Hey, sorry if this question seems basic however I am relatively new to C++ and have done some searching around but to no avail. I then came across this community and thought I would try it out :)

Basically, using Visual C++ 2008, I have a custom data structure, lets call it "MyStructure".

struct MyStructure {
	float x, y, z;
};

I am then creating an array of type 'MyStructure' later on in my code:

MyStructure myArray[100];

Now I know I can modify the array elements using the following syntax...

myArray[0].x = 12.0f;
myArray[0].y = 13.0f;
myArray[0].z = 15.0f;
myArray[1].x = 15.0f;
myArray[1].y = 13.0f;
myArray[1].z = 22.0f;
myArray[2].x = 10.0f;
myArray[2].y = 32.0f;
...
etc

... however some of these arrays are quite large which renders this method massively time consuming.

Is there a fast way of inputting values into each array element?

I tried the following syntax, however it seems to be quite temperamental:

MyScructure myArray = {{12.0f,13.0f,15.0f},{15.0f,13.0f,22.0f},{10.0f,32.0f,44.0f}};

...
later in my code when i need to modify the array
...

myArray = {{132.0f,134.0f,152.0f},{151.0f,133.0f,242.0f},{105.0f,372.0f,944.0f}};

Thanks in advance for any replies.

[vmanes]

You could store the data as a separate file, then the code to read and store the data to your array of structs is quite small and simple.

Your last example is almost correct in line 1 for initializing the array, but you must indicate that it's an array

MyScructure myArray[ ] = {{12.0f,13.0f,15.0f},.....

this way, sufficient number of array elements will be allocated to hold the initializer list.
Line 7 will not work, you cannot assign to an array in that manner. You have to visit each element and make singular assignments, as you show in your first example.

[aatwo]

Hi! Thanks for the reply.

Ah yes I see that error I made in the last code snippet where I was not assigning it as an array. That part was correct in my actual code I just re-wrote it wrong.

Thanks for the tip about using a separate file, it never occurred to me, however due to the nature of the program I don't think that is a viable option.

Line 7 will not work, you cannot assign to an array in that manner. You have to visit each element and make singular assignments, as you show in your first example.

I was afraid of this. I'll see if I can find a faster solution :)

Thanks again for the reply.