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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...n false;
return v1.z<v2.z;
}
};
typedef std::set<element,element_cmp> set_t;复制代码composite_key automatically generates equivalent code to that in element_cmp::operator(), and additionally allows for lookup on just the first n keys, but the underlying data s...
nvarchar和varchar相互转换、联合查询 - ORACLE - 清泛IT论坛，有思想、有深度
...fying the USING CHAR_CS argument converts text into the database character set. The output datatype is VARCHAR2.
Specifying the USING NCHAR_CS argument converts text into the national character set. The output datatype is NVARCHAR2.
（A表字段c_xxx:varchar，B表c_xxx:nvarchar）
select tran...
MongoDB.Driver.MongoConnectionException: Unable to connect to the prim...
...onnectionException: Unable to connect to the primary member of the replica set: Too many threads are already waiting for a connection..
C# Driver:1.3.1
Replset:
localhost:10001 (primary)
localhost:10002 (member)
I have initReplset and add localhost:10002 to the replset,
Then I create a n...
stdbool.h C99标准杂谈 - c++1y / stl - 清泛IT社区，为创新赋能！
.../02y9a5ye.aspx
Microsoft C conforms to the standard for the C language as set forth in the 9899:1990 edition of the ANSI C standard.
VS2012不支持：
https://social.msdn.microsoft.com/Forums/zh-CN/19818b42-3a4c-47bd-94d3-5dcde7f0df70/vs2012-c99
但是貌似自VS2013开始部分支持：
h...
NSIS做的安装程序，可接受命令行参数，实现静默安装，静默卸载 - 脚本技术 ...
...nstaller or uninstaller silently. See section 4.12 for more information./D sets the default installation directory ($INSTDIR), overriding InstallDir and InstallDirRegKey. It must be the last parameter used in the command line and must not contain any quotes, even if the path contains spaces. Only ab...
c++ boost库 序列化与反序列化 - c++1y / stl - 清泛IT社区，为创新赋能！
...ot;boost/serialization/vector.hpp"
#include "boost/serialization/set.hpp"
#include "boost/serialization/string.hpp"
#include "boost/serialization/shared_ptr.hpp"
//
const unsigned int SERIALIZATION_VERSION = 1;
//保存结构体数据
template<typename TemplateS...
SVN needs-lock 设置强制只读属性（官方资料） - 环境配置 - 清泛IT论坛，...
...ioning of binary files should follow the lock-modify-unlock model[1]. This setup uses the following three measuresforces users to use property svn:needs-lock on newly added binary files. Denies commits when the property is not available
sets the svn:needs-lock property on all already existing bi...
Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
...uot;, BLERead | BLEWrite );
int incom = 0;
int r, g, b ;
void setup() {
Serial.begin(9600);
// set Light pin to output mode
// set advertised local name and service UUID:
blePeripheral.setLocalName("ControlLED");
bleP...
HAXM 安装/启动失败？ - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
...试关闭 Hyper-V：
在管理员模式下运行以下命令：bcdedit /set hypervisorlaunchtype off运行后 重启电脑
HAXM 设备文件丢失
从错误提示 Unable to open HAXM device: ERROR_FILE_NOT_FOUND 看，可能是 HAXM 设备文件缺失。尝试重新安装 HAXM，或在命令行...
预编译头文件来自编译器的早期版本，或者预编译头为 C++ 而在 C 中使用它(...
现象&原因：
当 Visual C++ 项目启用了预编译头 (Precompiled header) 功能时，如果项目中同时混合有 .c 和 .cpp 源文件，则可能收到 C1853 编译器错误：fatal error C1853: 'pjtname.pch' precompiled header file is from a previous version of the compiler, or the...