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What is the purpose of XORing a register with itself? [duplicate]

xor eax, eax will always set eax to zero, right? So, why does MSVC++ sometimes put it in my executable's code? Is it more efficient that mov eax, 0 ? ...
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What is the reason behind cbegin/cend?

I wonder why cbegin and cend were introduced in C++11? 7 Answers 7 ...
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Convert SQLITE SQL dump file to POSTGRESQL

I've been doing development using SQLITE database with production in POSTGRESQL. I just updated my local database with a huge amount of data and need to transfer a specific table to the production database. ...
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Is short-circuiting logical operators mandated? And evaluation order?

Does the ANSI standard mandate the logical operators to be short-circuited, in either C or C++? 7 Answers ...
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Simple argparse example wanted: 1 argument, 3 results

The documentation for the argparse python module , while excellent I'm sure, is too much for my tiny beginner brain to grasp right now. I don't need to do math on the command line or meddle with formatting lines on the screen or change option characters. All I want to do is "If arg is A, do this...
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C# using streams

Streams are kind of mysterious to me. I don't know when to use which stream and how to use them. Can someone explain to me how streams are used? ...
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IE7 Z-Index Layering Issues

I've isolated a little test case of IE7's z-index bug, but don't know how to fix it. I have been playing with z-index all day long. ...
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No line-break after a hyphen

I'm looking to prevent a line break after a hyphen - on a case-by-case basis that is compatible with all browsers. 5 Answ...
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Javascript regex returning true.. then false.. then true.. etc [duplicate]

I have a strange problem with the validation I am writing on a form. It is a 'Check Username' button next to an input. The input default value is the username for example 'betamax'. When I press 'Check Username' it passes the regex and sends the username to the server. The server behaves as expected...
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The application was unable to start correctly (0xc000007b)

I have a client/server app which I have been developing on a single PC. Now it needs two serial ports, so I borrowed a PC from a friend. ...