CODEWITHSUNDEEP
c++stl
JonnyCplusplus
JonnyCplusplus

Reputation: 881

std::map one key, two values

What is the best way to map two values to one key?

ie An item with a value and bool.

Tried using:

std::map<std::string, std::pair<std::string, bool> > myMap2

But that doesn't seem like the correct solution. Is there a more elegant way to do this?

Upvotes: 15

Views: 23172

Answers (3)

ygao
ygao

Reputation: 102

Normally, I crate a simple mapValue struct/class.

Upvotes: 1

ildjarn
ildjarn

Reputation: 62975

That is indeed the correct solution. More generally, consider using std::tuple instead of std::pair for a uniform interface regardless of the number of values (as std::pair is obviously restricted to two), or boost::tuple if your compiler is too old to ship with a std:: or std::tr1:: implementation.

Upvotes: 7

John Zwinck
John Zwinck

Reputation: 249093

Either use std::pair<> as you did, or make a custom struct containing the values you want to store. I'd do the latter in most cases, as the values then have names more descriptive than first and second.

Upvotes: 6

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