Syncmap
add length func base on go 1.9 sync.map .
Install / Use
/learn @rfyiamcool/SyncmapREADME
syncmap
Golang官方在 1.9 加入了sync.map协程安全的map, 性能和安全得以保证，就是没有Length方法. 自己丰衣足食加了个补丁.
至于官方为什么不加Length方法原因，有兴趣的可以看看issue. 简单说官方认为 map 本来就不应该有length的实现.
How
在sync.map结构体里加了计数器，在触发Store和Delete时，Atomic.AddInit64 +1 -1就可以了.
To Do List
- 加入 test 测试单元
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