c++ - 如何在 C++ 中编写简短的文字？

Question

非常基本的问题:如何在 C++ 中编写 short 文字？

我知道以下几点:

• 2 是一个 int
• 2U 是一个 unsigned int
• 2L 是 long
• 2LL 是 long long
• 2.0f 是一个 float
• 2.0 是一个 double
• '\2' 是一个 char。

但是我将如何编写 short 文字？我试过 2S 但这给出了编译器警告。

Answer 1

((short)2)

是的，严格来说，它不是一个简短的文字，更像是一个强制转换的整数，但行为是相同的，我认为没有直接的方法。

That's what I've been doing because I couldn't find anything about it. I would guess that the compiler would be smart enough to compile this as if it's a short literal (i.e. it wouldn't actually allocate an int and then cast it every time).

以下内容说明了您应该对此有多担心:

a = 2L;
b = 2.0;
c = (short)2;
d = '\2';

编译->反汇编->

movl    $2, _a
movl    $2, _b
movl    $2, _c
movl    $2, _d