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C++ sorting and keeping track of indexes
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stable_sort(idx.begin(), idx.end(),
[&v](size_t i1, size_t i2) {return v[i1] < v[i2];});
return idx;
}
Now you can use the returned index vector in iterations such as
for (auto i: sort_indexes(v)) {
cout << v[i] << endl;
}
You can also choose to supply your or...
Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...
What does “@@ -1 +1 @@” mean in Git's diff output?
...time
+++ to-file to-file-modification-time
The time stamp looks like 2002-02-21 23:30:39.942229878 -0800 to indicate the date, time with fractional seconds, and time zone. The fractional seconds are omitted on hosts that do not support fractional time stamps.
You can change the header's c...
Questions every good Java/Java EE Developer should be able to answer? [closed]
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votes
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How can I limit Parallel.ForEach?
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answered Feb 15 '12 at 9:11
Nicholas ButlerNicholas Butler
22.3k44 gold badges4545 silver badges7070 bronze badges
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Hash collision in git
...aracter times 40... 160 bits. Now we know 10 bits is approximately 1000 (1024 to be exact) meaning that there are 1 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 different SHA-1 hashes... 1048.
What is this equivalent of? Well the Moon is made up of about 1047 atoms. So if we have ...
How to extract the year from a Python datetime object?
...e).
One key thing to note is that the time components can differ between 32-bit and 64-bit pythons in some python versions (2.5.x tree I think). So you will find things like hour/min/sec on some 64-bit platforms, while you get hour/minute/second on 32-bit.
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Calculate business days
I need a method for adding "business days" in PHP. For example, Friday 12/5 + 3 business days = Wednesday 12/10.
36 Answers...
How to get one value at a time from a generator function in Python?
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Yes, or next(gen) in 2.6+.
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Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags
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I think a newer version of hibernate (supporting JPA 2.0) should handle this. But otherwise you can work it around by annotating the collection fields with:
@LazyCollection(LazyCollectionOption.FALSE)
Remember to remove the fetchType attribute from the @*ToMany annotation.
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