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Finding the key from the resource in a std::map

General and Gameplay Programming Programming

Started by mind in a box July 10, 2010 01:34 PM

4 comments, last by mind in a box 13 years, 9 months ago

mind in a box

887

Author

July 10, 2010 01:34 PM

He all!

Can I somehow find the Key-Value in a std::map when I have the resource it holds?

Here is my scenario:

TheMap[L"Stone.png"]=SomeTexture;

but the blocks of my game only get the pointer to the texture. Now I want to save the world and I need to know the texture they have got.

D3D11-Renderer for Gothic I&II

SiCrane

11,840

July 10, 2010 01:42 PM

Two of your options are to use a boost bimap container or just iterate over your map until you find the element that contains your value.

iMalc

2,466

July 10, 2010 04:01 PM

Or, instead of a map you could stores the string 'key' value within the texture and use a std::set instead. That way you still just store pointers to the texture in the blocks, but they can follow this pointer to get to the key string.

"In order to understand recursion, you must first understand recursion."
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scope

108

July 10, 2010 08:43 PM

Or make a second map PointerToName[SomeTexture] = L"Stone.png";

Or make the name a member variable of the texture...

theOcelot

498

July 10, 2010 09:34 PM

Or just store the string that the block was created with.

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mind in a box

887

Author

July 11, 2010 03:55 AM

Thank you for all the suggestions! [smile]
I implemented SiCrane's approach. The std::map isn't very big, so it's okay to loop it for each block one time.

D3D11-Renderer for Gothic I&II

Finding the key from the resource in a std::map

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