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8.2

STL hash_multimap questions

Asked by wayside in C++ Programming Language, Microsoft Visual C++

Tags: hash_multimap, stl

1) Is hash_multimap supported on the major Unix compilers? I would hope so, but in Visual Studio .Net 20003 it is in the stdext namespace instead of the std namespace, so I wasn't sure, and I don't have immediate access to a unix box. Is it in the std namespace on unix?

2) Is there any way to control the ordering of elements when inserting multiple elements with the same key? Basically, I'd like to get the elements out in the same order that I inserted them, for any given key. For Visual C++, they come out like this:

if I have 5 elements with the same key x, that are n, n+1, n+2, n+3, n+4, and I insert them in that order, I get them out in this order:

n+1, n+2, n+3, n+4, n

I could always sort them after I get them out of the multimap, or, if the retrieval order is the same on every platform I can account for that, although I expect that is implementation-specific. It would be much easier for me if I don't have to sort them though.

Thanks.
 
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[+][-]12/15/06 11:43 AM, ID: 18148445Accepted Solution

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Zones: C++ Programming Language, Microsoft Visual C++
Tags: hash_multimap, stl
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Solution Provided By: Fippy_Darkpaw
Participating Experts: 2
Solution Grade: A
 
[+][-]12/15/06 12:33 PM, ID: 18148827Assisted Solution

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