Any STL data structure like pair that gives three items(types) instead of two?

Question

Question 1:

I'm using C++ 11, and I'm learning. I realize I can do this with two pairs:

pair<pair<<#class _T1#>, <#class _T2#>>, <#class _T3#>>

Is that the best way?

Question 2:

If I don't need different types, so same type for two items, is it a waste to use pair, what should I use then? For three items? (again same type)

std::tuple, http://en.cppreference.com/w/cpp/utility/tuple/tuple — Peter G., Mar 31 '13 at 20:25
For same-type (e.g. @Xeo): Could std::vector be a reasonable alternative? — FlorianH, Jun 22 '20 at 09:39

Xymostech · Accepted Answer · 2013-03-31T20:35:53.460

59

Use a std::tuple:

std::tuple<_T1, _T2, _T3>

Note that std::tuples support an arbitrary amount of types stored in them. Also, to access the elements, you can't do the nice pair.first/pair.second, you have to use the syntax std::get<n>(tuple), where n is the element you want to retrieve.

edited Mar 31 '13 at 20:35

answered Mar 31 '13 at 20:25

Xymostech

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@Arch1tect No problem. I'd much rather help you than some day have to deal with `std::pair – Xymostech Mar 31 '13 at 20:39
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What if you're stuck using C++98? – devinbost Sep 28 '18 at 06:08

Any STL data structure like pair that gives three items(types) instead of two?

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