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What is the exact meaning of IFS=$'\n'?
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Normally bash doesn't interpret escape sequences in string literals. So if you write \n or "\n" or '\n', that's not a linebreak - it's the letter n (in the first case) or a backslash followed by the letter n (in the other two cases).
$'somestring' is a syntax for st...
Does PostgreSQL support “accent insensitive” collations?
... to specify an "accent insensitive" collation (for a database, table or column), which means that it's possible for a query like
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CSS media queries: max-width OR max-height
When writing a CSS media query, is there any way you can specify multiple conditions with "OR" logic?
3 Answers
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Is gcc 4.8 or earlier buggy about regular expressions?
I am trying to use std::regex in a C++11 piece of code, but it appears that the support is a bit buggy. An example:
3 Answe...
Is a `=default` move constructor equivalent to a member-wise move constructor?
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Yes both are the same.
But
struct Example {
int a, b;
Example(int mA, int mB) : a{mA}, b{mB} { }
Example(const Example& mE) = default;
Example(Example&& mE) = default;
Example& operato...
What is hashCode used for? Is it unique?
...ere is a getHashCode() method in every controls, items, in WP7, which return a sequence of number. Can I use this hashcode to identify an item? For example I want to identify a picture or a song in the device, and check it whereabout. This could be done if the hashcode given for specific items is ...
std::function and std::bind: what are they, and when should they be used?
I know what functors are and when to use them with std algorithms, but I haven't understood what Stroustrup says about them in the C++11 FAQ .
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What Makes a Method Thread-safe? What are the rules?
Are there overall rules/guidelines for what makes a method thread-safe? I understand that there are probably a million one-off situations, but what about in general? Is it this simple?
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Why always ./configure; make; make install; as 3 separate steps?
Every time you compile something from source, you go through the same 3 steps:
4 Answers
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How to sort mongodb with pymongo
I'm trying to use the sort feature when querying my mongoDB, but it is failing. The same query works in the MongoDB console but not here. Code is as follows:
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