chore: enable C++23 and prefer std::expected (#6693)

CHANGELOG.md

@@ -74,6 +74,8 @@
 - Dev: Added Clazy linting in CI. (#6623)
 - Dev: Added custom clang-tidy module linting in CI. (#6626)
 - Dev: CMake option `USE_ALTERNATE_LINKER` now errors if the given linker can't be found. (#6692)
+- Dev: Enable C++ 23. (#6693)
+- Dev: Prefer `std::expected` over `nonstd::expected_lite`. (#6693)
 - Dev: Moved Twitch PubSub to liveupdates. (#6638)
 
 ## 2.5.4

CMakeLists.txt

@@ -270,7 +270,7 @@ else ()
     string(TIMESTAMP cmake_gen_date "%Y-%m-%d")
 endif ()
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # Generate resource files

src/util/Expected.hpp

@@ -1,6 +1,12 @@
 #pragma once
 
-#include <nonstd/expected.hpp>
+#include <version>
+
+#if __cpp_lib_expected >= 202202L
+#    include <expected>
+#else
+#    include <nonstd/expected.hpp>
+#endif
 
 #include <type_traits>
 
@@ -8,17 +14,29 @@ class QString;
 
 namespace chatterino {
 
+#if __cpp_lib_expected >= 202202L
+template <typename T, typename E>
+using Expected = std::expected<T, E>;
+
+// convenience function from nonstd/expected.hpp
+template <typename E>
+constexpr std::unexpected<std::decay_t<E>> makeUnexpected(E &&value)
+{
+    return std::unexpected<std::decay_t<E>>(std::forward<E>(value));
+}
+#else
 template <typename T, typename E>
 using Expected = nonstd::expected_lite::expected<T, E>;
 
-template <typename T>
-using ExpectedStr = Expected<T, QString>;
-
 // convenience function from nonstd/expected.hpp
 template <typename E>
 constexpr nonstd::unexpected<std::decay_t<E>> makeUnexpected(E &&value)
 {
     return nonstd::unexpected<std::decay_t<E>>(std::forward<E>(value));
 }
+#endif
+
+template <typename T>
+using ExpectedStr = Expected<T, QString>;
 
 }  // namespace chatterino