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Differences between unique_ptr and shared_ptr [duplicate]
...ated with make_shared. But if you create a unique_ptr<Derived>, then convert it to unique_ptr<Base>, and if Derived is virtual and Base is not, then the pointer will be deleted through the wrong type and there can be undefined behaviour. This can be fixed with an appropriate deleter-type...
Compare dates in MySQL
...
That is SQL Server syntax for converting a date to a string. In MySQL you can use the DATE function to extract the date from a datetime:
SELECT *
FROM players
WHERE DATE(us_reg_date) BETWEEN '2000-07-05' AND '2011-11-10'
But if you want to take advanta...
How is this fibonacci-function memoized?
...mechanism in Haskell is by-need: when a value is needed, it is calculated, and kept ready in case it is asked for again. If we define some list, xs=[0..] and later ask for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
Th...
Why is try {…} finally {…} good; try {…} catch{} bad?
...g the fact that an error occurred. try..finally will run your cleanup code and then the exception will keep going, to be handled by something that knows what to do with it.
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Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF
... below error when I execute the following script. What is the error about, and how it can be resolved?
21 Answers
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Trying to embed newline in a variable in bash [duplicate]
... This doesn't actually embed newlines, it embeds \n, which the echo -e converts to newlines as it prints. Depending on your actual goal, this may or may not do the trick.
– Gordon Davisson
Feb 4 '12 at 17:52
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Interface naming in Java [closed]
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later on you decide, well, there is a need for an interface here, so you convert your class to an interface.
then it becomes obvious: your original class was called User. your interface is now called User. maybe you have a UserProdImpl and a UserTestImpl. if you designed your application well, ev...
Internal Error 500 Apache, but nothing in the logs?
...in windows and then upload it to the server without the line endings being converted you will get this error.
in perl if you forget
print "content-type: text/html\r\n\r\n";
you will get this error
There are many reasons for it. so please first check your error log and then provide some more in...
Cordova: start specific iOS emulator image
... '--stdout', logPath,
'--exit'];
return spawn('ios-sim', simArgs);
}
convert iPhone-4s, 7.1 to valid argument com.apple.CoreSimulator.SimDeviceType.iPhone-4s, 7.1 for ios-sim.
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How do I force git to use LF instead of CR+LF under windows?
... out as whatever it is in the repo – hopefully LF (\n). Any CRLF will be converted to just LF on checkin.
With an existing repo that you have already checked out – that has the correct line endings in the repo but not your working copy – you can run the following commands to fix it:
git rm -...