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C++11 rvalues and move semantics confusion (return statement)
...ector<int> return_vector(void)
{
std::vector<int> tmp {1,2,3,4,5};
return tmp;
}
std::vector<int> &&rval_ref = return_vector();
The first example returns a temporary which is caught by rval_ref. That temporary will have its life extended beyond the rval_ref defini...
Why can't the C# constructor infer type?
...
133
Is there a philosophical reason why the constructor can't support type inference?
No. When...
Generate a heatmap in MatPlotLib using a scatter data set
...matplotlib.pyplot as plt
# Generate some test data
x = np.random.randn(8873)
y = np.random.randn(8873)
heatmap, xedges, yedges = np.histogram2d(x, y, bins=50)
extent = [xedges[0], xedges[-1], yedges[0], yedges[-1]]
plt.clf()
plt.imshow(heatmap.T, extent=extent, origin='lower')
plt.show()
This m...
C++ Modules - why were they removed from C++0x? Will they be back later on?
...
James McNellisJames McNellis
319k7070 gold badges865865 silver badges944944 bronze badges
...
How to correctly close a feature branch in Mercurial?
...ure-x
$ hg ci -m merge
$ hg heads
(1 head)
$ hg branches
default 43:...
feature-x 41:...
(2 branches)
$ hg branches -a
default 43:...
(1 branch)
Another way is to close a feature branch before merging using an extra commit:
$ hg up feature-x
$ hg ci -m 'Closed branch feature...
App Inventor 2 串口通信教程 - USB串口与蓝牙串口 · App Inventor 2 中文网
...BluetoothClient 组件
2. BluetoothClient 关键属性
3. BluetoothClient 关键方法
蓝牙串口通信积木块实现
界面设计
蓝牙连接积木
断开连接积木
发送文本数据积木
发...
MongoDB: Combine data from multiple collections into one..how?
...b.users.save({firstName:"Sarah",lastName:"T",gender:"F",country:"US",age:"13"});
var users = db.users.find();
db.comments.save({userId: users[0]._id, "comment": "Hey, what's up?", created: new ISODate()});
db.comments.save({userId: users[1]._id, "comment": "Not much", created: new ISODate()});
db.co...
How to use Elasticsearch with MongoDB?
...77c4d99175905fac65bffbf4c80cf7",
"build_timestamp" : "2014-05-22T12:27:39Z",
"build_snapshot" : false,
"lucene_version" : "4.7"
},
"tagline" : "You Know, for Search"
}
Now install the Elasticsearch plugins so it can play with MongoDB.
bin/plugin --install com.github.richardwilly98...
How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throw
...t and you can't upgrade it (should be effortless when already on a Servlet 3.0 compatible container), then you need to manually register the below PrimeFaces file upload filter in web.xml (it will parse the multi part request and fill the regular request parameter map so that FacesServlet can contin...