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Select Last Row in the Table
...d first() exists and provides you with the first file in the table but I don't know how to get the last insert.
16 Answer...
How to initialize a private static const map in C++?
...I add cout << A::myMap[1]; into main(). It gives an error. The error doesn't occur if I remove the const qualifiers, so I guess map's operator[] can't handle a const map, at least, not in the g++ implementation of the C++ library.
– Craig McQueen
Oct 31 '...
How to use the “number_to_currency” helper method in the model rather than view?
I would like to use to_dollar method in my model like this:
11 Answers
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Behaviour of increment and decrement operators in Python
...perator can be applied on a variable (like ++count ). It compiles, but it does not actually change the value of the variable!
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How to change an Eclipse default project into a Java project
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@Ricky It can be done via the UI in certain versions, with certain plugins.
– Chris Marasti-Georg
Apr 9 '13 at 13:45
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Composer killed while updating
...rder to get composer update to work in some situations.
However, if you're doing this on a live server, you shouldn't be using composer update at all. What you should instead do is:
Run composer update in a local environment (such as directly on your physical laptop/desktop, or a docker container/V...
Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
...o SELECT every column in a table,..." -- in that case, * vs col1, .., coln doesn't matter (but it DOES for programmer time, since * is shorter!).
– Matt Rogish
Sep 15 '08 at 19:23
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c++11 Return value optimization or move? [duplicate]
I don't understand when I should use std::move and when I should let the compiler optimize... for example:
4 Answers
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int a[] = {1,2,}; Weird comma allowed. Any particular reason?
...you just have to add a line. Likewise if you want to remove a line you can do so without worrying about whether it's the last line or not, and you can reorder lines without fiddling about with commas. Basically it means there's a uniformity in how you treat the lines.
Now think about generating cod...
Do sealed classes really offer performance Benefits?
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There are complex rules regarding calling type, virtual/nonvirtual, and I don't know them all so I can't really outline them for you, but if you google for sealed classes and virtual methods you might find some articles on the topic.
Note that any kind of performance benefit you would obtain from ...