From 54cc9c7e0a0c7fb95e5b5ecafc86a06f6cbe40db Mon Sep 17 00:00:00 2001
From: Nao Pross <naopross@thearcway.org>
Date: Sat, 8 Dec 2018 14:20:30 +0100
Subject: Add overly complicated templated operator overloading example

---
 operator-overloading.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 operator-overloading.cpp

diff --git a/operator-overloading.cpp b/operator-overloading.cpp
new file mode 100644
index 0000000..92ef2d8
--- /dev/null
+++ b/operator-overloading.cpp
@@ -0,0 +1,62 @@
+#include <iostream>
+#include <complex>
+
+namespace math {
+    template<typename T>
+    struct vec3 {
+        T x;
+        T y;
+        T z;
+    };
+}
+
+template<typename T>
+math::vec3<T> operator+(const math::vec3<T>& a, const math::vec3<T>& b) {
+    math::vec3<T> res;
+
+    res.x = a.x + b.x;
+    res.y = a.y + b.y;
+    res.z = a.z + b.z;
+
+    return res;
+}
+
+template<typename T>
+math::vec3<T> operator*(const T& scalar, const math::vec3<T>& vec) {
+    math::vec3<T> res;
+
+    res.x =  scalar * vec.x;
+    res.y =  scalar * vec.y;
+    res.z =  scalar * vec.z;
+
+    return res;
+}
+
+template<typename T>
+math::vec3<T> operator-(const math::vec3<T>& a, const math::vec3<T>& b) {
+    return a + static_cast<T>(-1) * b;
+}
+
+template<typename T>
+std::ostream& operator<<(std::ostream& os, const math::vec3<T>& vec) {
+    os << "<" << vec.x << ", " 
+              << vec.y << ", "
+              << vec.z << ">";
+
+    return os;
+}
+
+int main(int argc, char *argv[]) {
+
+    // using numeric_type = std::complex<int>;
+    using numeric_type = int;
+
+    math::vec3<numeric_type> a = {1, 2, 3};
+    math::vec3<numeric_type> b = {1, 2, 3};
+
+    std::cout << a + b << std::endl;
+    std::cout << a - b << std::endl;
+    std::cout << static_cast<numeric_type>(2) * b << std::endl;
+
+    return 0;
+}
-- 
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