swift的类型描述符

发布时间：2020-12-14 04:58:36 所属栏目：百科来源：网络整理

导读：Metatype Types A concrete or existential metatype in SIL must describe its representation. This can be: @thin,meaning that it requires no storage and thus necessarily represents an exact type (only allowed for concrete metatypes); @thick,m

Metatype Types

A concrete or existential metatype in SIL must describe its representation. This can be:

@thin,meaning that it requires no storage and thus necessarily represents an exact type (only allowed for concrete metatypes);
@thick,meaning that it stores a reference to a type or (if a concrete class) a subclass of that type; or
@objc,meaning that it stores a reference to a class type (or a subclass thereof) using an Objective-C class object representation rather than the native Swift type-object representation.

用于类型和函数类型的描述

https://github.com/apple/swift/blob/master/docs/SIL.rst#metatype-types

%2 = function_ref @ProtocolCase.NormalStruct.init() -> ProtocolCase.NormalStruct : [email?protected](method) (@thin NormalStruct.Type) -> NormalStruct // user: %3

（编辑：李大同）

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