nameof

此crate中定义的 name_of!() 宏接受绑定、类型、常量或函数作为参数，并返回其无限定字符串表示。如果标识符在当前上下文中不存在，则此宏将导致编译错误。此宏主要用于调试目的，并与 stringify!() 相比，以提高重构体验。

用法

将 nameof 添加到项目的 Cargo.toml 文件中作为依赖项

[dependencies]
nameof = "1.2.2"

要使用宏，请导入具有所需注解的crate

use nameof::name_of;

fn main() {
    let text = "Hello, World!";
    println!("Binding `{}` holds `{}`.", name_of!(text), text);
}

示例

name_of!() 宏的使用如下

use nameof::name_of;

struct TestStruct {
    test_field: i32,
}

impl TestStruct {
    const TEST_CONST: i32 = 1;
}

struct GenericStruct<T> {
    test_field_t: T,
}

fn greet() -> &'static str {
    "Hi, World"
}

fn main() {
    let text = "Hello, World!";

    println!("Binding `{}` holds `{}`.", name_of!(text), text);

    println!("Function `{}` says `{}`.", name_of!(greet), greet());

    println!(
        "Struct `{}` has a field `{}`.",
        name_of!(type TestStruct),
        name_of!(test_field in TestStruct)
    );

    println!(
        "Generic Struct `{}` has a field `{}`.",
        name_of!(type GenericStruct<String>),
        name_of!(test_field_t in GenericStruct<String>)
    );

    println!(
        "Struct `{}` has an associated constant `{}`.",
        name_of!(type TestStruct),
        name_of!(const TEST_CONST in TestStruct)
    );

    println!(
        "Standard types such as `{}` and `{}` also work.",
        name_of!(type i32),
        name_of!(type f64)
    );
}

或者，可以使用 name_of_type!(T) 代替 name_of!(类型 T)。

use nameof::name_of_type;

struct TestStruct {
    test_field: i32,
}

fn main() {
    println!("Struct is called `{}`.", name_of_type!(TestStruct));
    println!("Type is called `{}`.", name_of_type!(i32));
}

许可证

见 LICENSE.txt。