Search code examples
c++templatesindexingtuples

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?

Solution

  • 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));