[原]c++ vs c++cli (part0)

items :

CLR : commond language runtime 

CIL : comman intermediat langauge

MSIL: microsoft intermediat langauge

JIT : just in time 

VES :Virtual Execution System

 before we go on with c++ & c++\cli we just  take  simple breath here with native code,virtual machine and managed code 

Managed code	Native code
the code that executes under the management of a virtual machine	the code xecuted directly by the computer's CPU
include programmer convenience and enhanced security guarantees	Some complex with low level security guarantees

The Virtual Machine

C++/CLI applications execute in the context of the CLR. The CLR implements a virtual machine,

which is a software implementation of an idealized, abstract execution environment. Programs

that run on the CLR virtual machine use a language known as the Common Intermediate

Language (CIL). Microsoft’s implementation of CIL is often referred to as MSIL, or just plain IL.

The CLR relies on a JIT (just-in-time) compiler to translate the CIL code on demand into machine

code in order to execute the program.

The CLR virtual machine is Microsoft’s implementation of the Virtual Execution System

(VES), which is part of the ECMA standard. As processors change, you need only change the

way in which the executable code is generated from the processor-independent layer, and

you’ll still be able to run the old programs written for the earlier processor. Pure IL generated

by compilers targeting the CLR does not contain x86 instructions or any other object code that

is configured to run on a particular processor. Compilers output MSIL code that can run on the

virtual machine.

	Native	Managed
Pointer / Handle	*	^
Reference	&	%
Allocate	new	gcnew
Free	Delete	Delete(Optional) it will done auto by Garbage collector
Use Native Heap	ü	ü( Value types only)
Use Managed Heap	û	ü
Use Stack	ü	ü
Verifiability	* and & never	^ and % always

c++ is native code , C++CLI is managed code 

that what i want to tell You!!