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调用空智能指针对象的函数，Windows及Linux行为解析 - C/C++ - 清泛网 - 专...
...版本访问空智能指针对象函数会发生崩溃。
问题起因：一个智能指针对象使用IsNull()判断是否为空后，执行函数，仅在Linux开优化（-O0以上）发生崩溃，代码如下：
#include <stdio.h>
#include <memory>
#include <assert.h>
class RawValue :...
Quickly create a large file on a Linux system
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dd from the other answers is a good solution, but it is slow for this purpose. In Linux (and other POSIX systems), we have fallocate, which uses the desired space without having to actually writing to it, works with most modern disk based file systems, very fast:
For example:
fallocate -l 10G gen...
How do you create a REST client for Java? [closed]
With JSR 311 and its implementations we have a powerful standard for exposing Java objects via REST. However on the client side there seems to be something missing that is comparable to Apache Axis for SOAP - something that hides the web service and marshals the data transparently back to Java objec...
App Inventor 2 经典蓝牙(SPP) 硬件接入：hc05 · App Inventor 2 中文网
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显示已配对的SPP经典蓝牙列表：
选择一个蓝牙设备进行连接：
断开当前连接的设备：
错误处理：
常见问题解决
Error 515: Not connected to a Bluetooth device. ...
How to check if command line tools is installed
I have a macbook pro with OS X 10.8.2.
XCode is installed. I know this as it appears in the Applications directory.
There are also the xcodebuild and xcode-select files in /usr/bin
I need to know if the command line tools is installed.
Is there a command for it?
What can I do to see if XCode CLT is ...
Why malloc+memset is slower than calloc?
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The short version: Always use calloc() instead of malloc()+memset(). In most cases, they will be the same. In some cases, calloc() will do less work because it can skip memset() entirely. In other cases, calloc() can even cheat and not allocate any memory! However, malloc()+memset() will always...
How do I discover memory usage of my application in Android?
...() is our highest-level API for looking at overall memory usage. This is mostly there to help an application gauge how close the system is coming to having no more memory for background processes, thus needing to start killing needed processes like services. For pure Java applications, this should...
Error Domain=NSURLErrorDomain Code=-1005 “The network connection was lost.”
...n application which works fine on Xcode6-Beta1 and Xcode6-Beta2 with both iOS7 and iOS8. But with Xcode6-Beta3, Beta4, Beta5 I'm facing network issues with iOS8 but everything works fine on iOS7. I get the error "The network connection was lost." . The error is as follows:
...
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
...试着，在vs2010中，菜单“视图->属性管理器”，随便打开一个c++工程，展开树形结构，有个Microsoft.Cpp.Win32.user 项，在这项中的“vc++目录->库目录”中添加“G:\boost_1_52_0\stage\lib”（我的boost库放在G盘的），在“包含目录”中添加...
解决IIS发布时global_asax的dll 的CS0433冲突问题 - 更多技术 - 清泛网 - ...
...，折腾了好久，后来发现是发布后，bin 目录下已经有了一个 App_global.asax.dll ，而根目录下的 global.asax 没有删除，结果重复了。
解决方法：
删除 global.asax ；
PrecompiledApp.config 文件拷贝到网站根目录下；
问题解决。IIS,CS0433, g...