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check if a std::vector contains a certain object? [duplicate]

Is there something in <algorithm> which allows you to check if a std:: container contains something? Or, a way to make one, for example: ...
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Why is whitespace sometimes needed around metacharacters?

A few months ago I tattooed a fork bomb on my arm, and I skipped the whitespaces, because I think it looks nicer without them. But to my dismay, sometimes (not always) when I run it in a shell it doesn't start a fork bomb, but it just gives a syntax error. ...
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Is if(items != null) superfluous before foreach(T item in items)?

I often come across code like the following: 12 Answers 12 ...
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What's the simplest way to test whether a number is a power of 2 in C++?

I need a function like this: 17 Answers 17 ...
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JavaScript - cannot set property of undefined

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random.seed(): What does it do?

I am a bit confused on what random.seed() does in Python. For example, why does the below trials do what they do (consistently)? ...
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What is the difference between

Can some one please describe the usage of the following characters which is used in ERB file: 7 Answers ...
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returning in the middle of a using block

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Android - get children inside a View?

Given a View how can I get the child views inside it? 8 Answers 8 ...
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How to swap keys and values in a hash

How do I swap keys and values in a Hash? 6 Answers 6 ...