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Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...e you want to know more about how ObjectIds are created, here is the spec: http://www.mongodb.org/display/DOCS/Object+IDs#ObjectIDs-BSONObjectIDSpecification
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What is the use for Task.FromResult in C#
...using the async keyword.
I found this example:
public class TextResult : IHttpActionResult
{
string _value;
HttpRequestMessage _request;
public TextResult(string value, HttpRequestMessage request)
{
_value = value;
_request = request;
}
public Task<HttpRe...
Django database query: How to get object by id?
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CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...份立即传给用户，使用户觉得速度相当快。Squid 可以代理HTTP、FTP、GOPHER、SSL和WAIS等协议并且Squid 可以自动地进行处理，可以根据自己的需要设置Squid，使之过滤掉不想要的东西。
1.1 工作流程
当代理服务器中有客户端需要的数...
Does use of final keyword in Java improve the performance?
...
According to IBM - it doesnt for classes or methods.
http://www.ibm.com/developerworks/java/library/j-jtp04223.html
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STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...是默认的使用了less进行比较。
关于这个_Pr详解可见：http://www.cnblogs.com/zjfdlut/archive/2011/08/12/2135698.html
解决方法
好了，知道了出错原因，我们就自己重载<操作符了：
bool operator<(const a& a1, const a& a2)
{
if ( a1.m_a>=a2.m_a )
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Why is parenthesis in print voluntary in Python 2.7?
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How do I best silence a warning about unused variables?
...
C++17 now provides the [[maybe_unused]] attribute.
http://en.cppreference.com/w/cpp/language/attributes
Quite nice and standard.
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Use logging print the output of pprint
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Catch an exception thrown by an async void method
...nchronizationContext that was active when the async void method started. - https://msdn.microsoft.com/en-us/magazine/jj991977.aspx
Note that using Wait() may cause your application to block, if .Net decides to execute your method synchronously.
This explanation http://www.interact-sw.co.uk/iangbl...