The values of std::pair are by value. In your case though you could use std::pair<std::reference_wrapper<int>, std::reference_wrapper<int>>. ... <看更多>

/// Tag type for piecewise construction of std::pair objects. struct piecewise_construct_t { explicit piecewise_construct_t() = default; };. ... <看更多>

std::pair · 概要 · メンバ変数 · メンバ関数 · メンバ型 · 非メンバ関数 · タプルインタフェース · 推論補助 · 例. ... <看更多>

Choice 1 is ok for small "used only once" things. Essentially std::pair is still a struct. As stated by this comment choice 1 will lead to ... ... <看更多>