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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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SQL command to display history of queries
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try
cat ~/.mysql_history
this will show you all mysql commands ran on the system
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Why is Multiple Inheritance not allowed in Java or C#?
I know that multiple inheritance is not allowed in Java and C#. Many books just say, multiple inheritance is not allowed. But it can be implemented by using interfaces. Nothing is discussed about why it is not allowed. Can anybody tell me precisely why it is not allowed?
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Array vs. Object efficiency in JavaScript
...an array, too:
var a3 = [];
a3[29938] = "a";
a3[32994] = "b";
It's basically an array with holes in it, because every array does have continous indexing. It's slower than arrays without holes. But iterating manually through the array is even slower (mostly).
This is an object:
var a3 = {};
a3[2...
How to activate virtualenv?
... virtualenv venv --distribute
New python executable in venv/bin/python
Installing distribute.........done.
Installing pip................done.
$ source venv/bin/activate
(venv)$ python
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When to use virtual destructors?
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Virtual destructors are useful when you might potentially delete an instance of a derived class through a pointer to base class:
class Base
{
// some virtual methods
};
class Derived : public Base
{
~Derived()
{
// Do some important cleanup
}
};
Her...
Tracing XML request/responses with JAX-WS
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Following options enable logging of all communication to the console (technically, you only need one of these, but that depends on the libraries you use, so setting all four is safer option). You can set it in the code like in example, or as command line parame...
Comet and jQuery [closed]
...p of jQuery? If not, are there any good implementations of this pattern at all? And regardless of the answer to those questions, is there any documentation on this pattern from an implementation stand-point?
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PHP multidimensional array search by value
...return $key;
}
}
return null;
}
This will work. You should call it like this:
$id = searchForId('100', $userdb);
It is important to know that if you are using === operator compared types have to be exactly same, in this example you have to search string or just use == instead ===.
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How do I replace a character at a particular index in JavaScript?
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Note that it's generally not a good idea to extend base JavaScript classes. Use a plain utility function instead.
– Ates Goral
Sep 16 '09 at 5:40
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