定义：  
  class   B  
  {  
  private:  
          B()  
          {  
          }  
  friend   class   A;  
  };  
  将导致B无法被除A以外的其它任何class直接继承以后实例化，也就是说，在上面这个定义的基础上，如果你在定义：  

作者：July、youwang、yanxionglu。
时间：二零一一年三月二十六日
本文之总结：教你如何迅速秒杀掉：99%的海量数据处理面试题。有任何问题，欢迎随时交流、指正。

出处：http://blog.csdn.net/v_JULY_v。

【Nand flash的一些典型(typical)特性】

1.页擦除时间是200us，有些慢的有800us。

2.块擦除时间是1.5ms.

3.页数据读

Vim 替换命令汇总

Limitations of _AFXEXT

You can use the _AFXEXT pre-processor symbol for your extension DLLs as long as you do not have multiple layers of extension DLLs. If you have extension DLLs that call or derive from classes in your own extension DLLs, which then derive from the MFC classes, you must use your own preprocessor symbol to avoid ambiguity.

The problem is that in Win32, you must explicitly declare any data as __declspec(dllexport) if it is to be expor

how you can use the MFCxx.DLL and MFCxxD.DLL (where x is the MFC version number) shared dynamic link libraries with MFC applications and extension DLLs. For more information about regular DLLs, see Using MFC as Part of a DLL.

This technical note covers three aspects of DLLs. The last two are for the more advanced users:

在导出类中如果含有自定义的类型或者stl时，编译会报一堆的warning c4251下面是解决办法

I always try to get rid of compiler warnings. It just seems like a good thing to do. Warning-free code makes me happy. But some warnings just don't want to go away, and this is one of them. I use STL frequently, and my own templates from time to time, and every time I try to turn some code with templates

Total Commander支持直接调用CMD命令窗口，并且设置路径为当前激活窗口，快捷方式为Ctrl+G。

PowerCMD 是一款方便的命令行工具，支持多标签、自动保存、高亮搜索、行号显示、折叠等功能。

下面介绍如何在Total Commander中调用PowerCMD。

Step 1：修改用户命令，

在 Total Commander 的 usercmd.ini 中添加如下内容

[em_PowerCMD]
cmd=I:\Program Files\PowerCmd\PowerCmd.exe
path=I:\Program Files\PowerCmd\
param= /P "%P"

其中cmd是PowerCm