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Include all existing fields and add new fields to document
...peline operator which is nothing other than an alias to $addFieldsadded in 3.4
The $addFields stage is equivalent to a $project stage that explicitly specifies all existing fields in the input documents and adds the new fields.
db.collection.aggregate([
{ "$addFields": { "custom_field": "...
腾讯Tencent开源框架介绍（持续更新） - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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https://github.com/Tencent/libco 非常轻量的C++协程框架，2k~3k行代码量，采用epool+hook实现。libco是微信后台大规模使用的c/c++协程库，2013年至今稳定运行在微信后台的数万台机器上。
使用方式如下：
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Edit: Josip Rodin's answer below is better. Please use that one!
You might have an easier time...
Hidden Features of C#? [closed]
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