diff --git a/imgui.h b/imgui.h
index a336ccd06..99a736c40 100644
--- a/imgui.h
+++ b/imgui.h
@@ -43,7 +43,7 @@ Index of this file:
 // [SECTION] Dear ImGui end-user API functions
 // [SECTION] Flags & Enumerations
 // [SECTION] Tables API flags and structures (ImGuiTableFlags, ImGuiTableColumnFlags, ImGuiTableRowFlags, ImGuiTableBgTarget, ImGuiTableSortSpecs, ImGuiTableColumnSortSpecs)
-// [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>
+// [SECTION] Helpers: Debug log, Memory allocations macros, ImVector<>, Unreachable
 // [SECTION] ImGuiStyle
 // [SECTION] ImGuiIO
 // [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiPayload)
@@ -2150,7 +2150,7 @@ struct ImGuiTableColumnSortSpecs
 };
 
 //-----------------------------------------------------------------------------
-// [SECTION] Helpers: Debug log, memory allocations macros, ImVector<>
+// [SECTION] Helpers: Debug log, memory allocations macros, ImVector<>, Unreachable
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
@@ -2255,6 +2255,37 @@ struct ImVector
 };
 IM_MSVC_RUNTIME_CHECKS_RESTORE
 
+//-----------------------------------------------------------------------------
+// ImGui::Unreachable()
+// Provides an equivalent for std::unreachable() for C++<23. This signals to the compiler that a region is unreachable, allowing optimizations.
+//-----------------------------------------------------------------------------
+// If you are using C++>=23, use std::unreachable() in <utility>, and you may also define STD_UNREACHABLE_IS_AVAILABLE to substitute definitions.
+// Code is from: https://en.cppreference.com/w/cpp/utility/unreachable.html
+// Inclusion in the ImGUI namespace is chosen to avoid possible namespace collisions with stdlib >= 23.
+//-----------------------------------------------------------------------------
+namespace ImGui
+{
+//#define STD_UNREACHABLE_IS_AVAILABLE
+#ifdef STD_UNREACHABLE_IS_AVAILABLE 
+    #include <utility>
+    constexpr const auto Unreachable = ::std::unreachable;
+    #undef STD_UNREACHABLE_IS_AVAILABLE
+#else
+    [[noreturn]] inline void Unreachable()
+    {
+        // Uses compiler specific extensions if possible.
+        // Even if no extension is used, undefined behavior is still raised by
+        // an empty function body and the noreturn attribute.
+    #if defined(_MSC_VER) && !defined(__clang__) // MSVC
+        __assume(false);
+    #else // GCC, Clang
+        __builtin_unreachable();
+    #endif
+    }
+#endif
+    
+} // namespace ImGui
+
 //-----------------------------------------------------------------------------
 // [SECTION] ImGuiStyle
 //-----------------------------------------------------------------------------