chore: merge pull request #18 from threeal/add-error-comparison

Error: Add `Error` Comparison Operators

Author: threeal

error/include/error/error.hpp

@@ -39,4 +39,20 @@ Error format(fmt::format_string<T...> fmt, T&&... args) {
   return Error(fmt::format(fmt, std::forward<T>(args)...));
 }
 
+/**
+ * @brief Checks if two error objects are equal.
+ * @param lhs The left-hand side error object.
+ * @param rhs The right-hand side error object.
+ * @return True if equal, false otherwise.
+ */
+bool operator==(const Error& lhs, const Error& rhs);
+
+/**
+ * @brief Checks if two error objects are not equal.
+ * @param lhs The left-hand side error object.
+ * @param rhs The right-hand side error object.
+ * @return True if not equal, false otherwise.
+ */
+bool operator!=(const Error& lhs, const Error& rhs);
+
 }  // namespace error

error/src/error.cpp

@@ -6,4 +6,12 @@ Error::Error(const std::string& msg) : message(msg) {}
 
 const char* Error::what() const noexcept { return message.c_str(); }
 
+bool operator==(const Error& lhs, const Error& rhs) {
+  return lhs.message == rhs.message;
+}
+
+bool operator!=(const Error& lhs, const Error& rhs) {
+  return lhs.message != rhs.message;
+}
+
 }  // namespace error

error/test/error_test.cpp

@@ -33,3 +33,13 @@ TEST_CASE("Error Throwing and Catching") {
     }
   }
 }
+
+TEST_CASE("Error Comparison") {
+  const auto err = error::Error("unknown error");
+  const auto err_copy = err;
+  CHECK(err == err_copy);
+  CHECK_FALSE(err != err_copy);
+  const auto other_err = error::Error("other error");
+  CHECK_FALSE(err == other_err);
+  CHECK(err != other_err);
+}