英文:
How to add a field with a reserved keyword as its name to a structure?
问题
I'm trying to add a field called type to a V structure used for the C interop. It is failing, because type is a keyword too.
The original structure in C:
typedef struct some_s {
int type;
} some_t;
The structure declared in V:
#include "some.h"
[typedef]
struct C.some_t {
type int
}
The error when trying to compile the V source:
❯ v some.v
some.v:17:2: error: unexpected keyword `type`, expecting name
15 | [typedef]
16 | struct C.some_t {
17 | type int
| ~~~~
18 | }
Is there a way to mark the type as a name of a structure field?
英文:
I'm trying to add a field called type to a V structure used for the C interop. It is failing, because type is a keyword too.
The original structure in C:
typedef struct some_s {
int type;
} some_t;
The structure declared in V:
#include "some.h"
[typedef]
struct C.some_t {
type int
}
The error when trying to compile the V source:
❯ v some.v
some.v:17:2: error: unexpected keyword `type`, expecting name
15 | [typedef]
16 | struct C.some_t {
17 | type int
| ~~~~
18 | }
Is there a way to mark the type as a name of a structure field?
答案1
得分: 2
我在Discord for V的聊天中得到了Petr的帮助。非常感谢！
这很简单 - 如果你需要使用一个与现有关键字匹配的标识符，只需在它前面加上@。
在V中声明的结构现在正确了：
#include "some.h"
[typedef]
struct C.some_t {
@type int
}
关于@前缀的注释在枚举的文档中被“很好地隐藏”：
枚举字段不能重用保留关键字。然而，保留关键字可以用@进行转义。
英文:
I got help from Petr in the chat at Discord for V. Thanks a lot!
It's simple - if you need to use an identifier, which matches an existing keyword, just prefix it with @.
The structure declared in V, now properly:
#include "some.h"
[typedef]
struct C.some_t {
@type int
}
The note about the @ prefix is "well hidden" 
in the documentation of enums:
> Enum fields cannot re-use reserved keywords. However, reserved keywords may be escaped with an @.
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