[MSDN_vs2008] Casting Operators

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最新推荐文章于 2022-02-25 19:38:17 发布

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分类专栏： C++老马回头文章标签： casting c

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本文深入探讨了C++语言中几种特定的铸造操作符，包括动态铸造、静态铸造、const铸造、reinterpret铸造和安全铸造。通过实例分析了它们的使用场景和区别，特别强调了在何时使用const铸造和reinterpret铸造作为最后手段，以及它们与旧式铸造相比所具有的优势。

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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