class Node {
public:
float point[3];
};
int main(int argc, char** argv) {
float p[3] = { 34, 90, 10 };
Node *node = new Node();
node->point = p;
return 0;
}
This doesn't work as expected.
How should I initialize an array of a class object?
Array != pointer.
error: invalid array assignment
node->point = p;
Here is the correct way to copy the array:
std::copy(std::begin(p),std::end(p), std::begin(node->point));
If you know the size of the array at compile time, you should use std::array:
class Node {
public:
std::array<float,3> point;
};
std::array<float,3> p = {34.0f, 90.0f, 10.0f};
node->point = p;
Also, you may initialize the array via constructor and leave point as private data member:
// Ctor
Node(std::array<float,3> p) { point = p; }
// Calling
Node *node = new Node({34.0f, 90.0f, 10.0f});
// Or
std::array<float,3> p = {34.0f, 90.0f, 10.0f};
Node *node = new Node(p);
Otherwise, if you want to choose the size of the array at runtime, you should use std::vector.
When using your design, you must copy the values as Node reserves memory.
Whether your approach is a good practise is an other question. Initializing from outside is somewhat strange
class Node {
public:
float point[3];
};
int main(int argc, char** argv) {
float p[3] = { 34, 90, 10 };
Node *node = new Node();
memcpy (node->point, p, sizeof(p));
return 0;
}
// alternative version
int main(int argc, char** argv) {
Node *node = new Node();
node->point[0] = 34.0f;
node->point[1] = 90.0f;
node->point[2] = 10.0f;
return 0;
}
std::array<float, 3>insteadusing point_t = std::array<float, 3>;