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DLL Talk / How do I create a dynamic array in C++?

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Robert The Robot
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Posted: 27th Jan 2011 15:37
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I'm trying to port some of my DBPro functions over to a C++ plugin (I'm using Visual C++ Express 2008), to try and speed up my compile times, but I can't figure out how to create dynamic arrays that are global within the plugin.

In DBPro I can write two functions like this:


But how would I write this in C++? I can't figure out how to create a global variable within a C++ function, or how to extend an array the way I can in DBPro (though I have seen refrrence to vector classes, whatever they are). Any ideas?

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Brendy boy
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Joined: 17th Jul 2005
Location: Croatia
Posted: 27th Jan 2011 23:06
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int *TestArray=Null;

void One(int size){
TestArray=new int[size];
}

void Two(int old_size, int new_size){
int *temp=TestArray;
TestArray=new int[new_size];
memcpy(TestArray,temp,sizeof(int)*old_size);
delete []temp;
}

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Robert The Robot
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Posted: 28th Jan 2011 15:46
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Wow, this is brilliant! Thank you!

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IanM
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Posted: 28th Jan 2011 18:03
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Sorry, but it's not that brilliant - ou are using C++, not C, and dynamic array is definitely spelt 'std::vector' in C++.



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Omen
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Location: Maple Grove, MN US
Posted: 4th Feb 2011 07:02
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@Ian, that made me laugh - it made me think of how right$() is spelt 'fast right$()'

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MikeRK
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Location: United Kingdom
Posted: 31st Mar 2011 09:37
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You can get the functionality of a 'Dynamic Array' using an STL Container (i.e. Vector as IanM pointed out)

Other variations are;

std::map, std::list std::deque... etc.


Look here for a reference:

http://www.cplusplus.com/reference/stl/

All have their benefits depending on what you need.

Mikey

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