✨ fn_type_alias

一个进程属性宏，用于为属性函数生成具有给定标识符的类型别名。

示例

#[macro_use]
extern crate fn_type_alias;

#[type_alias(HelloWorldFn)] // The type alias will inherit its visibility from the function
pub(super) fn hello_world() {
	println!("hello world!");
}

#[type_alias(pub(crate), HelloWorldFn)] // The type alias will be pub(crate), but the function will be pub
pub fn hello_world() {
	println!("hello world!");
}

用例

此宏非常适合条件编译。例如，使用 fn_abi 宏

#[macro_use]
extern crate fn_type_alias;

#[macro_use]
extern crate fn_abi;

#[abi(
	linux32 = "C",
	linux64 = "C",
	win32 = "thiscall",
	win64 = "stdcall"
)]
#[type_alias(HelloWorldFn)]
pub extern fn hello_world() {
	println!("hello world!");
}

// Expands to when building for Windows 64-bit:
pub type HelloWorldFn = extern "stdcall" fn();
pub extern "stdcall" fn hello_world() {
	println!("hello world!");
}