allocating an array off a constexpr

quad_list.h

struct LineSegment {
    struct Vertex {
        glm::vec2 position;
        glm::vec2 normal;
        float width;
        uint32_t color;
        Vertex() = default;
        Vertex(const Vertex &) = delete;
    };

    static constexpr int VERTEX_COUNT = 2;
    Vertex vertices[VERTEX_COUNT];

    void set(const glm::vec2 & start_position,
             const glm::vec2 & end_position,
             float width,
             uint32_t color = 0xffffffff);
};