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Is returning by rvalue reference more efficient?
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Beta_ab&&
Beta::toAB() const {
return move(Beta_ab(1, 1));
}
This returns a dangling reference, just like with the lvalue reference case. After the function returns, the temporary object will get destructed. You should return Beta_ab by value, like the following
Beta_ab...
Copy multiple files in Python
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139
You can use os.listdir() to get the files in the source directory, os.path.isfile() to see if ...
Postgres: Distinct but only for one column
I have a table on pgsql with names (having more than 1 mio. rows), but I have also many duplicates. I select 3 fields: id , name , metadata .
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LINQ query to select top five
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answered Feb 2 '11 at 9:57
GidonGidon
16.8k55 gold badges4242 silver badges6363 bronze badges
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Android: “Path for project must have only one segment”
...tePad sample project as described here, but when I try to launch it (Ctrl+F11) I received the following error message box:
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Creating a expressjs middleware that accepts parameters
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157
function HasRole(role) {
return function(req, res, next) {
if (role !== req.user.role) r...
Matplotlib Legends not working
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165
You should add commas:
plot1, = plt.plot(a,b)
plot2, = plt.plot(a,c)
The reason you need th...