Trying to compare elements in a 2d list to see if their adjacent

[merry lake]

I know you cannot do whole array or structure comparison which is why i'm trying to put this function in a for loop and check each element one by one but for some reason i'm still getting "Invalid operands to binary expression ('Building' and 'Building')". I might have to make some changes to the other adjacent checks but for the first one of //check left die I think that one should be correct logically.

Example 2d array output:

X-1|X-1|X-1|
X-1|X-1|X-1|
X-1|X-1|X-1|
X-1|X-1|R6|
X-1|R3|S6|
G4|W2|R6|

[polar kestrel]

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[merry lake]

code:

int adjacent_die_score(Building building[MAX_ROWS][MAX_COLS], int current_row_index, int current_col_index)
{
    int total_adjacent_die = 0;

    // Check left die
    if (building[current_row_index > 0][current_col_index] ==
            building[current_row_index][current_col_index - 1]) {
        total_adjacent_die += 2;
    }

    // Check right die
    if (current_col_index < MAX_COLS - 1 &&
    building[current_row_index][current_col_index + 1] == building[current_row_index][current_col_index]) {
        total_adjacent_die += 2;
    }

    // Check top die
    if (current_row_index > 0 && building[current_row_index - 1][current_col_index] == building[current_row_index][current_col_index]) {
        total_adjacent_die += 2;
    }

    // Check bottom die
    if (current_row_index < MAX_ROWS - 1 && building[current_row_index +
    1][current_col_index] == building[current_row_index][current_col_index]) {
        total_adjacent_die += 2;
    }

    return total_adjacent_die;
}



int get_wood_points(Building building[][MAX_COLS])
{
    int current_row_index,
        current_col_index,
        wood_points;


    for (current_row_index = 0; current_row_index < MAX_ROWS; current_row_index++)
    {
        for (current_col_index = 0; current_col_index < MAX_COLS; current_col_index++)
        {
            if (building[current_row_index][current_col_index].material_type == 'W')
            {
              wood_points += adjacent_die_score(building, current_row_index, current_col_index);
            }
        }
    }

    return wood_points;
}

[unborn crown]

@merry lake You can't just compare two Buildings like that, yet

You must define an operator== in your class in order to do Building == Building

[merry lake]

what would be the type of that operator. This is my current struct

struct Building
{
    char material_type;
    int face_value;
};

[unborn crown]

!cppref operator overloading

[polar kestrel]

cppreference.com

operator overloading

[merry lake]

is there another way of doing it? I don't think i'm allowed to do that. I'm going to have to involve a lot of if statments i think

[alpine bronze]

Am I reading the line under //check left die correctly?

I’m on mobile so no highlighting

[unborn crown]

If you want to be able to write building[current_row_index][current_col_index + 1] == building[current_row_index][current_col_index] you must define operator== for Building.

Alternatively, you could make a method to do the check: building[current_row_index][current_col_index + 1].equals(building[current_row_index][current_col_index])

If you aren't allowed to do that, then you have to compare the members of the struct manually.

[merry lake]

!solved