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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it has limited features. We enabled App Inventor with multi-touch gestures detection, suc...
Calling C/C++ from Python?
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I started my journey in the Python <-> C++ binding from this page, with the objective of linking high level data types (multidimensional STL vectors with Python lists) :-)
Having tried the solutions based on both ctypes ...
What is the maximum number of characters that nvarchar(MAX) will hold?
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I just started my morning asking me the same question and both of your answers conjured a big smile on my face. +1.
– Matthis Kohli
Aug 16 '16 at 5:13
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npm - how to show the latest version of a package
...ideo explains how outdated and update work from NPM docs.npmjs.com/getting-started/updating-local-packages
– Metropolis
Sep 10 '18 at 5:21
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What are '$$' used for in PL/pgSQL
...The $$ is a delimiter you use to to indicate where the function definition starts and ends. Consider the following,
CREATE TABLE <name> <definition goes here> <options go here, eg: WITH OIDS>
The create function syntax is similar, but because you are going to use all sorts of SQ...
Rails.env vs RAILS_ENV
... get the current logger or RAILS_ROOT to get the path to the root folder.
Starting from Rails 2.x, Rails introduced the Rails module with some special methods:
Rails.root
Rails.env
Rails.logger
This isn't just a cosmetic change. The Rails module offers capabilities not available using the stand...
Solr vs. ElasticSearch [closed]
...with the recently introduced Amazon CloudSearch (see the introductory post Start Searching in One Hour for Less Than $100 / Month), because both claim to cover the same use cases in principle.
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Best practices for overriding isEqual: and hash
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Start with
NSUInteger prime = 31;
NSUInteger result = 1;
Then for every primitive you do
result = prime * result + var
For objects you use 0 for nil and otherwise their hashcode.
result = prime * result + [var hash...
Easy way to pull latest of all git submodules
...it after first pull that had submodules included, so that everything would start working properly.
– Ben Usman
May 12 '16 at 21:25
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Android - Writing a custom (compound) component
...;com.example.views.MyView /> and your setData and onFinishInflate calls start throwing NPEs, and you have no idea why.
– Christopher Perry
Mar 9 '13 at 1:37
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