Error C2440: 'return' : cannot convert from 'int [2]' to 'int (&&)[2]'

Question

I haven't programmed in a while, so my code might be a bit sloppy. The only thing the program does is create a 4x4 bool grid with only the top left value true. It then runs it with the checkAdjacentTiles, that should return the tiles touching it (the one to the right and the one underneath). I get an error instead. I have a feeling this has to do with my vector: std::vector<int[2]> checkAdjacentTiles(bool[4][4]); , since the int [2]. Thanks for the help!

#include <stdio.h>
#include <vector>

std::vector<int[2]> checkAdjacentTiles(bool[4][4]);

int main() {
    bool grid[4][4];

    grid[0][0] = 1;
    std::vector<int[2]> temp = checkAdjacentTiles(grid);

    for (int i = 0; i < (int)temp.size(); i++) {
        printf("(%i, %i)\n", temp[i][0], temp[i][1]);
    }

    getchar();
    return 0;
}

std::vector<int[2]> checkAdjacentTiles(bool checkGrid[4][4]) {
    int relAdjacentSides[4][2] = { { -1, 0 }, { 0, 1 }, { 1, 0 }, { 0, -1 } };
    std::vector<int[2]> adjacentSides;

    for (int x = 0; x < 4; x++) {
        for (int y = 0; y < 4; y++) {
            for (int i = 0; i < 4; i++) {

                if (x + relAdjacentSides[i][0] >= 0 && x + relAdjacentSides[i][0] < 4) {
                    if (y + relAdjacentSides[i][1] >= 0 && y + relAdjacentSides[i][1] < 4) {
                        if (!checkGrid[x + relAdjacentSides[i][0], y + relAdjacentSides[i][1]]) {

                            bool stop = 0;
                            for (int v = 0; v < (int)adjacentSides.size(); v++) {
                                if (adjacentSides[v][0] == x + relAdjacentSides[i][0] && adjacentSides[v][1] == y + relAdjacentSides[i][1]) {
                                    stop = 1;
                                    break;
                                }
                            }

                            if (!stop) {
                                adjacentSides.push_back({ x + relAdjacentSides[i][0], y + relAdjacentSides[i][1] });
                            }

                        }
                    }
                }

            }
        }
    }

    return adjacentSides;
}

Answer 1

I can't use int[2] in a vector for some reason. I ended up using std::pair<int,int> instead and it works fine. Thanks jhnnslschnr.