[MSDN_vs2008] Casting Operators

There are several casting operators specific to the C++ language. 

These operators are intended to remove some of the ambiguity and danger inherent in old style C language casts. 

These operators are:

• dynamic_cast   Used for conversion of polymorphic types.

• static_cast   Used for conversion of nonpolymorphic types.

• const_cast   Used to remove the const, volatile, and __unaligned attributes.

• reinterpret_cast   Used for simple reinterpretation of bits.

• safe_cast    Used to produce verifiable MSIL.

Use const_cast and reinterpret_cast as a last resort, since these operators present the same dangers as old style casts. However, they are still necessary in order to completely replace old style casts.

const_cast

	const int a = 10;
	const int* const_p = &a;
	//int* pb = const_cast<int*>(&a);         //其实这两行用什么方式转换指针似乎不重要
	int* pb = (int*)(&a);
	*pb = 11;
	cout<<&a<<"\t\t"<<a<<endl;
	cout<<const_p<<"\t\t"<<*const_p<<endl;
	cout<<pb<<"\t\t"<<*pb<<endl;

结果:

0012FF60                10
0012FF60                11
0012FF60                11

网上一位分析的比较详细，此处链接一下。

http://www.cnblogs.com/ider/archive/2011/07/22/cpp_cast_operator_part2.html