Adding common functions (read file)

common/CMakeLists.txt

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+project(common_lib CXX)
+
+add_library(common SHARED common_functions.cpp common_functions.hpp)
+
+target_compile_definitions(common PUBLIC $<$<AND:$<CONFIG:Debug>,$<STREQUAL:$<CXX_COMPILER_ID>,GNU>>:_GLIBCXX_DEBUG>)
+
+target_compile_options(common PUBLIC ${COMPILE_FLAGS})
+
+target_link_options(common PUBLIC ${LINKER_OPTIONS})

common/common_functions.cpp

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+//
+// Created by postaron on 31/07/24.
+//
+
+#include "common_functions.hpp"
+#include <iostream>
+#include <format>
+
+std::optional<std::ifstream> common::read_file(const std::filesystem::path &problemFile) noexcept {
+    std::ifstream file(problemFile);
+    if (!file.is_open()) {
+        const auto error_state = file.rdstate();
+        switch (error_state) {
+            case std::ios::badbit:
+                std::cerr << "Fatal I/O error occurred.\n";
+                break;
+            case std::ios::eofbit:
+                std::cerr << "End of file reached.\n";
+                break;
+            case std::ios::failbit:
+                std::cerr << "Non-fatal I/O error occurred.\n";
+                break;
+            default:
+                std::cerr << "impossible to reach.\n";
+                break;
+        }
+        const auto path_string = problemFile.string();
+        const auto msg = std::format("Failed to open file {}: ", path_string);
+        std::perror(msg.c_str());
+        return std::nullopt;
+    }
+    return file;
+
+}

common/common_functions.hpp

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+//
+// Created by postaron on 31/07/24.
+//
+
+#ifndef ADVENTOFCODE2023_COMMON_FUNCTIONS_HPP
+#define ADVENTOFCODE2023_COMMON_FUNCTIONS_HPP
+
+#include <fstream>
+#include <filesystem>
+#include <optional>
+
+namespace common {
+    namespace fs = std::filesystem;
+
+    std::optional<std::ifstream> read_file(const fs::path &problemFile) noexcept;
+}
+
+#endif //ADVENTOFCODE2023_COMMON_FUNCTIONS_HPP