This topic compares features among the different /clr compilation modes. For more information, see /clr (Common Language Runtime Compilation).

Feature Comparison

Feature	Mixed (/clr)	Pure (/clr:pure)	Safe (/clr:safe)	Related Information
.NET Framework class library	supported	supported	supported	.NET Framework Class Library Reference
CRT library	supported	supported	В	Run-Time Routines by Category
MFC/ATL	supported	В	В	MFC Reference \| ATL Class Overview
Unmanaged Functions	supported	В	В	Mixed (Native and Managed) Assemblies
Unmanaged Data	supported	supported	В	Pure and Verifiable Code
Callable from Unmanaged Functions	supported	В	В	How to: Migrate to /clr:pure
Supports calling unmanaged Functions	supported	C-style functions only	P/Invoke only	Using C++ Interop (Implicit PInvoke)
Supports Reflection	DLLs only	supported	supported	Reflection in C++

See Also