如何通过索引设置 std: : tuple 元素？

可以使用 std::get通过索引从 std::tuple获取元素。比方说，准备好了元组的元素如何按索引？

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最佳答案

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));

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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;