CODEWITHSUNDEEP
c++templatesindexingtuples
Behrouz.M
Behrouz.M

Reputation: 3573

How to set std::tuple element by index?

One can get an element from std::tuple by index using std::get. Analogically, how to set tuple's element by index?

Upvotes: 126

Views: 82959

Answers (2)

Nicol Bolas
Nicol Bolas

Reputation: 473282

std::get returns a reference to the value. So you set the value like this:

std::get<0>(myTuple) = newValue;

This of course assumes that myTuple is non-const. You can even move items out of a tuple via std::move, by invoking it on the tuple:

auto movedTo = std::get<0>(std::move(myTuple));

Upvotes: 184

amit kumar
amit kumar

Reputation: 21012

The non-const version of get returns a reference. You can assign to the reference. For example, suppose t is tuple, then: get<0>(t) = 3;

Upvotes: 29

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