Das ist neu in ReSharper C⁠+⁠+ 2026.1

ReSharper C⁠+⁠+ 2026.1 brings significant performance optimizations across all stages of the IDE experience, specifically tuned for the demands of large-scale Unreal Engine projects. Our measurements on the Lyra sample project for Unreal Engine in Out-of-Process mode demonstrate these improvements:

• Initial indexing of C⁠+⁠+ code is now up to 20% faster, reducing the wait when you open a solution for the first time.
• Warm startup time has been improved by more than 20%, so returning to a previously opened solution is noticeably faster.
• Backend memory usage after a warm start has been reduced by up to 21%, leaving more resources available for the rest of your workflow.

This release also adds support for two additional language features:

• _Countof operator: ReSharper C⁠+⁠+ now recognizes the _Countof operator from C2Y (the upcoming C standard), which returns the element count of an array.
• Extended floating-point types: bfloat16_t, float16_t, and float128_t floating-point types standardized in C⁠+⁠+⁠23 are now supported.

ReSharper C⁠+⁠+ 2026.1 improves compatibility with compiler-specific extensions:

• Nested functions: ReSharper C⁠+⁠+ now supports GCC's extension for defining functions inside other functions in C code.
• _Nullable/_Nonnull qualifiers: Clang's pointer nullability qualifiers are now recognized by the parser.

Reduce cognitive load with ReSharper C⁠+⁠+⁠'⁠s new auto-import support for C⁠+⁠+⁠20 modules. When you use an exported symbol but the corresponding import declaration is missing, the IDE now provides a smart suggestion to insert it automatically. Currently, auto-import is supported only for symbols exported directly from primary module interface units and module partitions.

Postfix completion has been extended to cover the following scenarios:

• Primitive types: Postfix completion previously only worked with class and struct types. It now also handles expressions of primitive types like int, bool, and float.
• Literals: Postfix completion now works after literals, so typing 42.cos expands to cos(42).
• User-defined literal suffixes: Code completion is now available for user-defined literal operators. When you type a literal followed by _, ReSharper C⁠+⁠+ suggests matching operator"" suffixes that are visible in the current scope.

Two auto-indent improvements contribute to a smoother editing experience:

• Pressing Enter between the braces of a control-flow statement or a class definition now correctly positions the cursor with proper indentation even when attributes are present (e.g. class [[deprecated]] MyClass {}).
• Auto-indentation inside extern blocks now respects the Indent linkage specification block members formatting setting.

ReSharper C⁠+⁠+ now indexes Unreal Engine plugins by default. With the growing use of plugins in Unreal Engine projects and the recent performance gains, indexing plugins by default provides better code analysis and navigation out of the box. You can restore the previous behavior on the ReSharper | Options | Code Editing | C/C⁠+⁠+ | Unreal Engine page in Settings.

ReSharper C⁠+⁠+ also adds support for the UnrealHeaderTool changes in the upcoming Unreal Engine 5.8. In particular, the DECLARE_DYNAMIC_MULTICAST_DELEGATE macros no longer trigger false-positive errors in code analysis.

ReSharper C⁠+⁠+ 2026.1 updates the bundled Clang-Tidy binary, bringing the latest checks and enhancements from the LLVM 22 release.

A new inspection detects designated initializers that appear in a different order than the corresponding members are declared in the struct. Since C⁠+⁠+⁠20 requires designated initializers to follow the declaration order, out-of-order initializers result in a compilation error. ReSharper C⁠+⁠+ now flags these cases and provides a quick-fix that automatically reorders the initializer list to match the struct definition.

Another new inspection warns you when a function has a different access level (public, protected, or private) than the virtual function it overrides in the base class. While C⁠+⁠+ permits changing the access level of an override, doing so is often unintentional and can lead to surprising behavior. The inspection helps catch these subtle mismatches.

This release extends Unused symbol inspections to class members defined in .cpp source files. Previously, these members were assumed to be externally visible and excluded from the Unused symbol analysis. Now, they are analyzed the same way as static functions and anonymous namespace members.

We've refined the gutter marks in C⁠+⁠+ files to help you navigate and understand complex codebases with minimal effort.

• Tooltips with semantic highlighting: Tooltips that appear when hovering over gutter marks now feature semantic highlighting, making them easier to read at a glance.
• Navigation to base classes: A new gutter icon on class definitions lets you navigate upward in the inheritance hierarchy to base classes, complementing the existing marks for navigating to derived classes.

Go to Declaration and other navigation actions now work on the opening brace in brace initialization expressions (e.g. MyStruct { 1 }), in addition to the type name.

ReSharper C⁠+⁠+ tooltips are now available in Visual Studio 2026, restoring the tooltip support that was missing in the initial Visual Studio 2026 compatibility release. Tooltip presentation has also been improved: icons now help distinguish between symbol types, and theming support has been enhanced.

Mehrere Editor-Bedienelemente von ReSharper wurden überarbeitet, um besser mit der modernen Optik von Visual Studio zu harmonieren.

Die neu gestaltete Code-Completion-Oberfläche bietet jetzt eine übersichtlichere und konsistentere Darstellung im Editor.

Wir haben auch verschiedene andere Bedienelemente modernisiert, darunter Parameterinfo-Popups, Tooltips und weitere Editor-Popups. Dabei haben wir veraltete visuelle Darstellungen ersetzt und das Erscheinungsbild über verschiedene Designs und DPI-Einstellungen hinweg verbessert.

The updated UI now supports Visual Studio’s editor zoom feature, ensuring completion lists and parameter info scale correctly when zoom levels change.

ReSharper C⁠+⁠+ 2026.1 fixes several issues with the project model:

• Windows Driver Kit (WDK) projects: ReSharper C⁠+⁠+ now correctly recognizes WDK-specific platform toolsets and provides the appropriate default preprocessor definitions.
• WinUI 3 projects: Include paths are now correctly configured.
• Library directories for Type Libraries: ReSharper C⁠+⁠+ now resolves COM Type Library files (.tlb) from Library Directories configured in Visual Studio project settings.