test.cpp

#include "klecs.h"

#include <iostream>

using namespace klecs;

struct vec3 {
    int elements[3];

    vec3 operator+(const vec3 &rhs) {
        return vec3{.elements = {
                        elements[0] + rhs.elements[0],
                        elements[1] + rhs.elements[1],
                        elements[2] + rhs.elements[2],
                    }};
    }

    vec3 &operator+=(const vec3 &rhs) { return *this = *this + rhs; }
};

struct Transform {
    vec3 position;
};

struct Rigidbody {
    vec3 linear_velocity;
};

int main() {
    World world{};

    EntityId right =
        world.spawn(Transform{.position = {0, 0, 0}}, Rigidbody{.linear_velocity = {1, 0, 0}});
    EntityId left =
        world.spawn(Transform{.position = {0, 0, 0}}, Rigidbody{.linear_velocity = {-1, 0, 0}});

    world.query<Transform &, Rigidbody &>(
        [](const EntityId &id, Transform &transform, const Rigidbody &rigidbody) {
            transform.position += rigidbody.linear_velocity;
        });

    const Transform &right_transform = std::get<0>(*world.get<const Transform &>(right));
    const Transform &left_transform = std::get<0>(*world.get<const Transform &>(left));

    klecs_assert(right_transform.position.elements[0] == 1, "should move one unit right");
    klecs_assert(left_transform.position.elements[0] == -1, "should move one unit left");

    std::cout << "Tests passed" << std::endl;

    return 0;
}