No appropriate default constructor available in struct with glm vectors - c++

Question

in .h:
enum collisionType {AB, BA, AoverB, AunderB};
struct Collision {
public:
collisionType type;
glm::vec2 point1;
glm::vec2 point2;
Collision(enum collisionType, glm::vec2, glm::vec2);
};
in .cpp:
Collision::Collision(enum collisionType collisType, glm::vec2 p1, glm::vec2 p2) : type(collisType), point1(p1), point2(p2)
{
}
using it
std::vector<Collision> collisions;
glm::vec2 point1(11.0, 12.0);
glm::vec2 point2(12.0, 13.0);
collisions.push_back(Collision(AoverB, point1, point2));
Getting error C2512: 'Collision' : no appropriate default constructor available, why?

Answer 1

You can read here the requirements for a type T to be well suited for std::vector.
Default-constructible is not listed there.
I also tried compiling this minimal code sample, in which X doesn't have a default constructor, and it compiles fine with MSVC:
#include <vector>
struct X {
X(int a, int b) : A(a), B(b) {}
int A;
int B;
};
int main() {
std::vector<X> v;
v.push_back(X(10,20));
}
So, the problem must be elsewhere in your code.
Anyway, you may want to add a constructor with no arguments to make your Collission class "default-constructible", and make the compiler happy:
struct Collision {
// Default constructor.
// Initialize data members to some init values.
Collision() {
...
}
PS Note that struct in C++ is equivalent to class { public: ..., so you can omit the public: line in your code: it's implied by the use of the keyword struct.

Answer 2

The following code compiles fine, it's something else that is the problem.
#include <glm/vec2.hpp>
#include <vector>
enum collisionType {AB, BA, AoverB, AunderB};
struct Collision {
public:
collisionType type;
glm::vec2 point1;
glm::vec2 point2;
Collision(enum collisionType, glm::vec2, glm::vec2);
};
Collision::Collision(enum collisionType collisType, glm::vec2 p1, glm::vec2 p2) : type(collisType), point1(p1), point2(p2)
{
}
int main()
{
std::vector<Collision> collisions;
glm::vec2 point1(11.0, 12.0);
glm::vec2 point2(12.0, 13.0);
collisions.push_back(Collision(AoverB, point1, point2));
}