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Difference between `data` and `newtype` in Haskell
...#-}!Int {-# UNPACK #-}!Int
No pointers! The two Int fields are unboxed word-sized fields in the Book constructor.
Algebraic data types
Because of this need to erase the constructor, a newtype only works when wrapping a data type with a single constructor. There's no notion of "algebraic" newty...
Difference between abstraction and encapsulation?
...ction is not defined in terms of information hiding, e.g., note the use of words such as "ignore" and "extracting." However, we should also note the use of the words "suppress" and "suppressing" in some of the above examples. In short, you might say that abstraction dictates that some information is...
Escaping keyword-like column names in Postgres
...
Simply enclose year in double quotes to stop it being interpreted as a keyword:
INSERT INTO table (id, name, "year") VALUES ( ... );
From the documentation:
There is a second kind of identifier: the delimited identifier or
quoted identifier. It is formed by enclosing an arbitrary sequence ...
How do I find where an exception was thrown in C++?
...;libunwind.h>
namespace
{
void
print_reg(std::ostream & _out, unw_word_t reg) noexcept
{
constexpr std::size_t address_width = std::numeric_limits< std::uintptr_t >::digits / 4;
_out << "0x" << std::setfill('0') << std::setw(address_width) << reg;
}
ch...
Explode string by one or more spaces or tabs
...
I think you want preg_split:
$input = "A B C D";
$words = preg_split('/\s+/', $input);
var_dump($words);
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How to negate the whole regex?
...
codingBat plusOut using regex
codingBat repeatEnd using regex
codingbat wordEnds using regex
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“unary operator expected” error in Bash if condition
...x-compatible single bracket version [ ... ]. Inside a [[ ... ]] compound, word-splitting and pathname expansion are not applied to words, so you can rely on
if [[ $aug1 == "and" ]];
to compare the value of $aug1 with the string and.
If you use [ ... ], you always need to remember to double quot...
Plurality in user messages
...olve an unsolvable problem. And remember Steve Krug's law: Remove half the words. Then do it again. I use: "Delete {x} item(s)?"
– Serge Wautier
Sep 7 '11 at 7:52
add a commen...
How to replace text between quotes in vi
...r way, e.g.:
ci' - change inside the single quotes
ciw - change inside a word
ci( - change inside parentheses
dit - delete inside an HTML tag, etc.
More about different vim text objects here.
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How to tell if a string is not defined in a Bash shell script
...on results in a test only for a parameter that is unset (...) ${parameter:+word} : Use Alternate Value. If parameter is null or unset, nothing is substituted, otherwise the expansion of word is substituted."
– David Tonhofer
Apr 26 '12 at 11:01
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