C++ pass an array of bitfields by reference - c++

Question

I'm trying put my map render (console, ASCII) to one function, but it don't compile.
It should be look like this:
struct tiles {
unsigned is_visible : 1;
//...
} tile[y][x];
void render_map(const tiles (tile&)[y][x]) {
for (int i = 0; i < y; i++) {
if (tile[y].is_visible == 0) {
//...
}
}
}
int main() {
render_map(tile);
//...
}
I try to do as in this answer: C++ pass an array by reference. (const tiles (tile&)[y][x])
Thanks to all, now it's work!
struct tiles {
unsigned is_visible : 1;
//...
} tile[y][x];
void render_map(const tiles (&tile)[y][x]) {
for (int i = 0; i < y; i++) {
for (int j = 0; j < x; j++) {
if (tile[i][j].is_visible == 0) {
//...
}
}
}
}
int main() {
render_map(tile);
//...
}
And i'll think about using vector.
Sorry for such stupid question :)

Answer 1

You could so something like this:
struct Tiles {
unsigned is_visible : 1;
//...
};
const int x = 5;
const int y = 5;
Tiles tiles[x][y];
void render_map(const Tiles tile[x][y]) {
for (int i = 0; i < y; i++) {
if (tile[y].is_visible == 0) { // tile is a 2d array, not a 1D, thus error
//...
}
}
}
int main() {
render_map(tiles);
//...
}
However, since this is C++, I don't see why you don't use a std::vector.
Also read this answer.
With a std::vector, you could do this for example:
void print_vector(std::vector< std:: vector<Tiles> >& v) {
for(unsigned int i = 0; i < v.size(); ++i)
for(unsigned int j = 0; j < v.size(); ++j)
j += 0;
}
int main() {
std::vector< std:: vector<Tiles> >v;
v.resize(2); // make space for two vectors of tiles
Tiles t;
t.is_visible = 0;
v[0].push_back(t);
v[1].push_back(t);
print_vector(v);
return 0;
}