1 files changed, 59 insertions, 0 deletions
diff --git a/simple-classes.cpp b/simple-classes.cpp
new file mode 100644
index 0000000..c21837b
--- /dev/null
+++ b/simple-classes.cpp
@@ -0,0 +1,59 @@
+#include "simple-classes.hpp"
+
+#include <iostream>
+
+
+// implementation for the default constructor
+// math::vec3i::vec3i() {
+//     x = 0;
+//     y = 0;
+//     z = 0;
+// }
+
+// here is a modern implementation that 
+// uses a C++11 feature called `member initializers'
+math::vec3i::vec3i() : x(0), y(0), z(0) {
+    // does nothing special
+}
+
+// implementation for the copy constructor, that
+// copies the other object
+math::vec3i::vec3i(const math::vec3i& other) {
+    // in this case we copy only the components
+    x = other.x;
+    y = other.y;
+    z = other.z;
+}
+
+// impl for a custom constructor
+math::vec3i::vec3i(int x_, int y_, int z_) {
+    x = x_;
+    y = y_;
+    z = z_;
+}
+
+
+void math::vec3i::zero() {
+    x = 0;
+    y = 0;
+    z = 0;
+}
+
+int math::vec3i::dot(const vec3i& other) const {
+    return x * other.x + y * other.y + z * other.z;
+}
+
+
+int main(int argc, char *argv[]) {
+    
+    // a vector with zeroes
+    math::vec3i v;
+    // a copy of v
+    const math::vec3i u(v);
+    // a vector initialized 
+    math::vec3i w(1, 2, 3);
+
+    std::cout << u.dot(w) << std::endl;
+
+    return 0;
+}