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How do I forward declare an inner class? [duplicate]
...tion order so that the nested class is fully defined first
Create a common base class that can be both used in the function and implemented by the nested class.
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What do column flags mean in MySQL Workbench?
...as binary strings. There is no character set so sorting and comparison is based on the numeric values of the bytes in the values.)
UN - Unsigned (non-negative numbers only. so if the range is -500 to 500, instead its 0 - 1000, the range is the same but it starts at 0)
UQ - Create/remove Unique...
How do I convert hex to decimal in Python? [duplicate]
... int(0xff) will do the right thing. It only requires an explicit base if it's passed as a string.
– cassm
Jan 15 '16 at 17:11
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App Inventor 2 上传文件到服务器的方案全总结 - App Inventor 2 中文网 - ...
1、图片Base64化，然后通过Web客户端POST文本的方式，发送数据，服务端base64解码后，存储文件。下载过程是Web客户端通过网络url下载文件到手机。
类似地，也可以将图片Base64化后分片存储到网络微数据库。下...
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...每个MQTT平台应该是有限制的，经过实际测试befa.com平台，base64文本大小约100KB以内的消息订阅可以正常接收，超过则无法接收。建议你自己的平台也进行一下测试，如果有限制，则要考虑源头压缩图片后再base64传输。
注：图片ba...
Difference: std::runtime_error vs std::exception()
...
std::exception is the class whose only purpose is to serve as the base class in the exception hierarchy. It has no other uses. In other words, conceptually it is an abstract class (even though it is not defined as abstract class in C++ meaning of the term).
std::runtime_error is a more spe...
How do I explicitly specify a Model's table-name mapping in Rails?
...>= 3.2 (including Rails 4+ and 5+):
class Countries < ActiveRecord::Base
self.table_name = "cc"
end
Rails <= 3.1:
class Countries < ActiveRecord::Base
self.set_table_name "cc"
...
end
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Center/Set Zoom of Map to cover all visible Markers?
...t's usage:
There are many approaches for doing what you asked for:
Grid based clustering
Distance based clustering
Viewport Marker Management
Fusion Tables
Marker Clusterer
MarkerManager
You can read about them on the provided link above.
Marker Clusterer uses Grid Based Clustering to cluster ...
Is System.nanoTime() completely useless?
...e fact its frequency can vary (and hence its relationship to elapsed time) based on power-management settings.
So, on Windows, this was a problem up until WinXP SP2, but it isn't now.
I can't find a part II (or more) that talks about other platforms, but that article does include a remark that Li...
Purpose of Django setting ‘SECRET_KEY’
... 'django.contrib.messages' + settings.SECRET_KEY
contrib/sessions/backends/base.py:89: pickled_md5 = md5_constructor(pickled + settings.SECRET_KEY).hexdigest()
contrib/sessions/backends/base.py:95: if md5_constructor(pickled + settings.SECRET_KEY).hexdigest() != tamper_check:
contrib/s...