Extern 函式

Rust supports generics, which lets you abstract algorithms or data structures (such as sorting or a binary tree) over the types used or stored.

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Speaker Notes

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  • Rust 會根據引數型別和傳回的值來推斷 T 的型別。

  • 這與 C++ 模板 (template) 類似,但 Rust 會立即對泛型函式進行部分編譯,因此函式必須適用於所有符合限制條件的型別。舉例來說,如果 n == 0,請嘗試修改 pick 以傳回 even + odd。即使只使用具有整數的 pick 建立例項,Rust 仍會將其視為無效。但 C++ 就能讓您這麼做。

  • Generic code is turned into non-generic code based on the call sites. This is a zero-cost abstraction: you get exactly the same result as if you had hand-coded the data structures without the abstraction.