1 files changed, 16 insertions, 2 deletions
diff --git a/include/book_store/price.hh b/include/book_store/price.hh
index 39f14b8..223b1e9 100644
--- a/include/book_store/price.hh
+++ b/include/book_store/price.hh
@@ -17,14 +17,16 @@ public:
   usd(price_type price) : _price(price) {}
   usd(const std::string &price) : _price(std::stod(price)) {}
 
+  [[nodiscard]] auto value() const noexcept -> price_type;
+
   auto operator=(const std::string &value) -> usd & {
     _price = std::stod(value);
 
     return *this;
   }
 
-  friend auto operator<<(std::ostream &output_stream, const usd &price)
-      -> std::ostream & {
+  friend auto operator<<(std::ostream &output_stream,
+                         const usd &price) -> std::ostream & {
     output_stream << price._price;
 
     return output_stream;
@@ -33,6 +35,18 @@ public:
   friend auto operator==(const usd &lhs, const usd &rhs) -> bool {
     return std::abs(lhs._price - rhs._price) < 0.0001;
   }
+
+  friend auto operator+(const usd &lhs, const usd &rhs) -> usd {
+    return {lhs._price + rhs._price};
+  }
+
+  friend auto operator*(const usd &lhs, const usd &rhs) -> bool {
+    return std::abs(lhs._price * rhs._price) < 0.0001;
+  }
+
+  friend auto operator+=(const usd &lhs, const usd &rhs) -> bool {
+    return std::abs(lhs._price + rhs._price) < 0.0001;
+  }
 };
 } // namespace book_store::product::price