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data.table vs dplyr: can one do something well the other can't or does poorly?
... and the relational algebra behind it, which is all about the tabular data transformation. @Arun you should note that set operators are very easy do-able by wrapping data.table function and of course brings significant speedup.
– jangorecki
Jan 14 '15 at 19:33
...
How do I pass a unique_ptr argument to a constructor or a function?
...elf always passes unique_ptr values by rvalue reference (for instance when transforming them into shared_ptr). The rationale for that might be that it is slightly more efficient (no moving to temporary pointers is done) while it gives the exact same rights to the caller (may pass rvalues, or lvalues...
App Inventor 2 扩展 · App Inventor 2 中文网
...ained in How to Build App Inventor from the MIT sources. Later, when you transform you component to an extension, you do not need a special companion, but can use the ordinary companion, e.g., from the Play Store. (Part of the extension “magic” is that is that the required code for the extensi...
MFC Telnet Application（mfc telnet 端口，代码实现、不调用telnet.exe） ...
...调用telnet.exe。程序源码工程升级后，可能出现编译不过的情况，请将stdafx.h中0x0410全部改为0x0501即可。The article demonstrates an MFC GUI Telnet application with server capabilities for incoming connections support.
Download demo - 29.9 KB
Download source - 42....
vc/mfc *通配符 批量删除文件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...0'也一样，笔者亲测，删除有时成功有时失败。
改用C++的FindNextFile，支持 * 通配符查找文件，核心代码如下：
WIN32_FIND_DATA FindFileData;
char szCurPath[MAX_PATH + 1] = { 0 };
GetCurrentDirectory(MAX_PATH, szCurPath);
CString findFileName;
findFileName....
SHFileOperation 这个API函数怎么用起来结果飘忽不定？ - C/C++ - 清泛网 -...
...，笔者亲测，删除有时成功有时失败。
解决：
改用C++的FindNextFile，支持 * 通配符查找文件，核心代码如下：
WIN32_FIND_DATA FindFileData;
char szCurPath[MAX_PATH + 1] = { 0 };
GetCurrentDirectory(MAX_PATH, szCurPath);
CString findFileName;
findFileName....
c++读注册表 - C/C++ - 清泛网 - 专注C/C++及内核技术
...CESS == rc)
{
path = szBuffer; //处理读出来的值
RegCloseKey(hKey);
}
}
c++ 注册表
VS工程“生成事件”之文件拷贝 - C/C++ - 清泛网 - 专注C/C++及内核技术
... "$(SolutionDir)$(ConfigurationName)\conf\"
（/D 只复制时间戳最新的文件，/Y 不提示覆盖，/E 递归子目录）
实际上就是执行copy、xcopy等Dos命令，具体用法可参照Dos帮助。$(SolutionDir)等宏命令可参考：
VS 拷贝事件 文件拷贝
c++编译错误：invalid new-expression of abstract class type - C/C++ - ...
...出错，说明父类（接口）中有纯虚函数没有实现。接口里的纯虚函数全部需要实现，这样才能new 子类。纯...出现这个错误原因是new 了一个抽象类出错，说明父类（接口）中有纯虚函数没有实现。
接口里的纯虚函数全部需要实...