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Sorting a vector in descending order
...
Actually, the first one is a bad idea. Use either the second one, or this:
struct greater
{
template<class T>
bool operator()(T const &a, T const &b) const { return a > b; }
};
std::sort(numbers.begin(), numbers.end(),...
How to test that no exception is thrown?
I know that one way to do it would be:
15 Answers
15
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How do I get a substring of a string in Python?
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Just for completeness as nobody else has mentioned it. The third parameter to an array slice is a step. So reversing a string is as simple as:
some_string[::-1]
Or selecting alternate characters would be:
"H-e-l-l-o- -W-o-r-l-d"[::2] # outputs "Hello World"
The a...
Why is subtracting these two times (in 1927) giving a strange result?
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It's a time zone change on December 31st in Shanghai.
See this page for details of 1927 in Shanghai. Basically at midnight at the end of 1927, the clocks went back 5 minutes and 52 seconds. So "1927-12-31 23:54:08" actually happened twic...
What is referential transparency?
...hat capital is Edinburgh.
This sentence cannot be transformed to a nutty one. Problem solved! The point of Quine was to say that natural language is messy, or at least complicated, because it is made to be convenient for practical use, but philosophers and logicians should bring clarity by under...
What is the difference between Hibernate and Spring Data JPA
...nd it's intended for native querying, and if you only intend to use JDBC alone, then you are better off using Spring JDBC to deal with the JDBC verbosity.
Therefore, Hibernate and Spring Data are complementary rather than competitors.
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Copy constructor for a class with unique_ptr
...) ) {}
};
int main()
{
A a( 42 );
A b = a;
}
You can, as NPE mentioned, use a move-ctor instead of a copy-ctor but that would result in different semantics of your class. A move-ctor would need to make the member as moveable explicitly via std::move:
A( A&& a ) : up_( std::move( a....
Why would one use the Publish/Subscribe pattern (in JS/jQuery)?
...ern (in JS/jQuery), but I'm having a hard time getting to grips with why one would use this pattern over 'normal' JavaScript/jQuery.
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How to rollback just one step using rake db:migrate
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For starters
rake db:rollback will get you back one step
then
rake db:rollback STEP=n
Will roll you back n migrations where n is the number of recent migrations you want to rollback.
More references here.
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Best practice for Django project working directory structure
...n my ~/projects/ directory, both have a bit different structure.:
Stand-alone websites
Pluggable applications
Stand-alone website
Mostly private projects, but doesn't have to be. It usually looks like this:
~/projects/project_name/
docs/ # documentation
scripts/
manage.py ...