feat(error): add Error struct

error/CMakeLists.txt

@@ -3,8 +3,9 @@ cmake_minimum_required(VERSION 3.0)
 project(error)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wpedantic")
+set(CMAKE_CXX_STANDARD 11)
 
-add_library(error src/example.cpp)
+add_library(error src/error.cpp)
 target_include_directories(error PUBLIC include)
 
 if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
@@ -19,7 +20,7 @@ if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
 
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage -fPIC -O0")
 
-    add_executable(error_test test/example_test.cpp)
+    add_executable(error_test test/error_test.cpp)
     target_link_libraries(error_test PRIVATE error Catch2::Catch2WithMain)
     catch_discover_tests(error_test)
   endif()

error/include/error/error.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <exception>
+
+namespace error {
+
+/**
+ * @brief A struct that represents error information.
+ */
+struct Error : public std::exception {
+  /**
+   * @brief Returns the explanatory string.
+   * @return Pointer to a null-terminated string with explanatory information.
+   */
+  const char* what() const noexcept override;
+};
+
+}  // namespace error

error/src/error.cpp

@@ -0,0 +1,7 @@
+#include <error/error.hpp>
+
+namespace error {
+
+const char* Error::what() const noexcept { return "unknown error"; }
+
+}  // namespace error

error/test/error_test.cpp

@@ -0,0 +1,8 @@
+#include <catch2/catch_test_macros.hpp>
+#include <error/error.hpp>
+
+TEST_CASE("test Error::what") {
+  const error::Error err;
+  const std::string expected("unknown error");
+  REQUIRE(expected.compare(err.what()) == 0);
+}