c - 如何从关键字 Zig 引用 C 符号？

Question

我想从 Zig 调用 error(3) 函数。

我可以通过定义一个名称不是 Zig 关键字的新符号来做到这一点:

@cInclude("error.h");
@cDefine("_error", "error");

这是执行此操作的推荐方法，还是有不同的方法来获取名称 error，因为 c.error 显然不起作用？

Answer 1

引自 Identifiers

Identifiers [...] must not overlap with any keywords. [...]If a name that does not fit these requirements is needed, [...] the @"" syntax may be used.

// example.zig
// run with `zig run example.zig -lc`

const c = @cImport({                                                                                
    @cInclude("error.h");                                                                           
});                                                                                                 
                                                                                                    
pub fn main() !void {
    // Names inside `@"` `"` are always recognised as identifiers.                                                                               
    _ = c.@"error"(0, 0, "this uses @\"error\"\n");                                                 
}

您还可以将 c.@"error" 分配给新函数 c_error 或使用 @cDefine("_error", "error"); 就像你一样:

// alternatives.zig
// run with `zig run alternatives.zig -lc`

const c = @cImport({
    @cInclude("error.h");
    @cDefine("_error", "error");
});

const c_error = c.@"error";

pub fn main() !void {
    _ = c._error(0, 0, "this uses _error\n");
    _ = c_error(0, 0, "this uses c_error()\n");
}