🐛 Bug fix for C++ calculator returns.

This was due to not compiling the calculator.cpp file after making changes to the calculator.hpp file.

Author: rentruewang

cpp/.gitignore

@@ -31,4 +31,4 @@
 *.out
 *.app
 
-/build/
+build/

cpp/calculator/calculator.cpp

@@ -8,22 +8,28 @@ using namespace std;
 
 shared_ptr<expression> expression::operator+(
     const shared_ptr<expression>& other) const {
-    return make_unique<evaluation>(shared_from_this(), other, "+",
+    return make_shared<evaluation>(shared_from_this(), other, "+",
                                    [](int a, int b) { return a + b; });
 }
 
 shared_ptr<expression> expression::operator-(
     const shared_ptr<expression>& other) const {
-    return make_unique<evaluation>(shared_from_this(), other, "-",
+    return make_shared<evaluation>(shared_from_this(), other, "-",
                                    [](int a, int b) { return a - b; });
 }
 
 shared_ptr<expression> expression::operator*(
     const shared_ptr<expression>& other) const {
-    return make_unique<evaluation>(shared_from_this(), other, "*",
+    return make_shared<evaluation>(shared_from_this(), other, "*",
                                    [](int a, int b) { return a * b; });
 }
 
+shared_ptr<expression> expression::operator/(
+    const shared_ptr<expression>& other) const {
+    return make_shared<evaluation>(shared_from_this(), other, "/",
+                                   [](int a, int b) { return a / b; });
+}
+
 expression::~expression() {}
 
 literal::literal(int data) : data_(data) {}

cpp/calculator/calculator.hpp

@@ -16,6 +16,7 @@ class expression : public enable_shared_from_this<expression> {
     shared_ptr<expression> operator+(const shared_ptr<expression>& other) const;
     shared_ptr<expression> operator-(const shared_ptr<expression>& other) const;
     shared_ptr<expression> operator*(const shared_ptr<expression>& other) const;
+    shared_ptr<expression> operator/(const shared_ptr<expression>& other) const;
 
     virtual shared_ptr<const expression> simplify() const = 0;
     virtual string to_string() const = 0;