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Why should the copy constructor accept its parameter by reference in C++?

Why must a copy constructor's parameter be passed by reference? 8 Answers 8 ...
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What's the difference between a POST and a PUT HTTP REQUEST?

They both seem to be sending data to the server inside the body, so what makes them different? 17 Answers ...
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Xcode duplicate/delete line

Coming from Eclipse and having been used to duplicate lines all the time, it's pretty strange finding out that Xcode has no such function. Or does it? ...
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Const in JavaScript: when to use it and is it necessary?

...across the const keyword in JavaScript. From what I can tell, it is used to create immutable variables , and I've tested to ensure that it cannot be redefined (in Node.js): ...
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Android error: Failed to install *.apk on device *: timeout

I'm getting this error from time to time and don't know what causing this: When trying to run/debug an Android app on a real device (Galaxy Samsung S in my case) I'm getting the following error in the Console: ...
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javac option to compile all java files under a given directory recursively

I am using the javac compiler to compile java files in my project. The files are distributed over several packages like this: com.vistas.util , com.vistas.converter , com.vistas.LineHelper , com.current.mdcontect . ...
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Change R default library path using .libPaths in Rprofile.site fails to work

I am running R on Windows, not as an administrator. When I install a package, the following command doesn't work: 15 Answer...
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What is the 'dynamic' type in C# 4.0 used for?

... The dynamic keyword is new to C# 4.0, and is used to tell the compiler that a variable's type can change or that it is not known until runtime. Think of it as being able to interact with an Object without having to cast it. dynamic cust = GetCustomer(...
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What is “loose coupling?” Please provide examples

I can't seem to grok the concept of "loose coupling." I suppose it doesn't help that the word "loose" usually has a negative connotation, so I always forget that loose coupling is a good thing. ...
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Change SQLite database mode to read-write

How can I change an SQLite database from read-only to read-write? 14 Answers 14 ...