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vs2010编译boost若干问题解决 - 开源 & Github - 清泛网 - 专注C/C++及内核技术

vs2010编译boost若干问题解决首先说下环境,win7,vs2010。先在http: www.boost.org users download 上下载boost安装包,我下的是1.52.0版。按照说明,直接运行bootstr...首先说下环境,win7,vs2010。 先在http://www.boost.org/users/download/上下载boost安...
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关于 __VA_ARGS__ 宽字符版本的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术

关于 __VA_ARGS__ 宽字符版本的问题在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时:#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __...在写一个可变参数的记录日志函数,考虑到宽字符(Unicode版本)时: #defin...
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C++ Lock-free Hazard Pointer(冒险指针) - C/C++ - 清泛网 - 专注C/C++及内核技术

...引用计数使用的标记是计数数值一,对应的原子操作性能问题就成为它无法摆脱的原罪。而 Hazard Pointer 使用的标记更为轻巧,一般通过在链表中标记该对象的指针实现,回收时如果发现链表中有对应的指针就不进行内存回收,...
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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术

...ctions/CMakeFiles/MathFunctions.dir/all] Error 2 make: *** [all] Error 2 问题分析: 首先看build/makefile文件,关于MakeTable有如下规则: # Build rule for target. MakeTable: cmake_check_build_system $(MAKE) -f CMakeFiles/Makefile2 MakeTable .PHONY : MakeTable 再看Makefile2...
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PHP “php://input” vs $_POST

... The reason is that php://input returns all the raw data after the HTTP-headers of the request, regardless of the content type. The PHP superglobal $_POST, only is supposed to wrap data that is either application/x-www-form-urlencoded (standard content type for...
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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP

... can be used to detect if a variable has been already initialized. Additionally and more ideal is the solution of empty() since it does not generate a warning or error message if the variable is not initialized. From PHP documentation: No warning is generated if the variable does not exist. T...
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MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术

...都是通过发送和接收消息来完成的。 这样就带来了一些问题,如一旦计算机的CPU被某个进程占用,或系统资源紧张时,发送到消息队列 中的消息就暂时被挂起,得不到实时处理。因此,不能简单地通过Windows消息引发一个对定时...
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Why is require_once so bad to use?

...system keeps a log of what's already been included/required. Every *_once call means checking that log. So there's definitely some extra work being done there but enough to detriment the speed of the whole app? ... I really doubt it... Not unless you're on really old hardware or doing it a lot. I...
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How do I read any request header in PHP

... IF: you only need a single header, instead of all headers, the quickest method is: <?php // Replace XXXXXX_XXXX with the name of the header you need in UPPERCASE (and with '-' replaced by '_') $headerStringValue = $_SERVER['HTTP_XXXXXX_XXXX']; ELSE IF: you run PHP...
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App Inventor 2 屏幕管理与多屏幕教程 · App Inventor 2 中文网

... 方法三:第一个Screen作为引导页 绝对布局兼容性问题 雷电模拟器中标签不显示 原因 解决方案 模拟器调试建议 屏幕生命周期 多屏幕App性能优化 屏幕数量建议 使用虚拟屏幕替...