1 files changed, 37 insertions, 0 deletions
diff --git a/namespaces.cpp b/namespaces.cpp
new file mode 100644
index 0000000..2e93b61
--- /dev/null
+++ b/namespaces.cpp
@@ -0,0 +1,37 @@
+#include <iostream>
+
+#include "namespaces.hpp"
+
+// to access a namespace the notation is `<namespace>::<element>'
+// it is possible to create nested namespaces (!) `<nsA>::<nsB>::elm'
+int math::dot(math::vec3i v, math::vec3i w) {
+    return v.x * w.x + v.y * w.y + v.z * w.z;
+}
+
+// alternatively (but not recommended) we can enclose the code
+// in a namespace declaration
+namespace math {
+    double dot(vec3d v, vec3d w) {
+        return v.x * w.x + v.y * w.y + v.z * w.z;
+    }
+}
+
+
+int main(int argc, char *argv[]) {
+
+    math::vec3i a = { 1, 2, 3 };
+    math::vec3i b = { 1, 2, 3 };
+    std::cout << math::dot(a, b) << std::endl;
+
+    // it is also possible to specify to implicitly 
+    // always use the namespace in a scope
+    {
+        using namespace math;
+
+        vec3d c = { .5, .2, 11.2 };
+        vec3d d = { .2, .2, 12.3 };
+        std::cout << dot(c, d) << std::endl;
+    }
+
+    return 0;
+}