From e6583045f0a2a8fa50b77c7d442bb336615bab96 Mon Sep 17 00:00:00 2001
From: Glasses-Neo <meganeo.programmer@gmail.com>
Date: Tue, 5 Mar 2024 02:27:07 +0900
Subject: [PATCH 1/2] :sparkles: Add `isInstanceOf` macro

---
 src/oolib.nim           | 12 ++++++++++++
 tests/is_instanceof.nim | 28 ++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 tests/is_instanceof.nim

diff --git a/src/oolib.nim b/src/oolib.nim
index 823519e..dfe563f 100644
--- a/src/oolib.nim
+++ b/src/oolib.nim
@@ -161,3 +161,15 @@ macro protocoled*(typeDef: untyped): untyped =
   result = typeDef
 
   ProtocolTable[protocolName.basename.strVal] = typeDef[2]
+
+macro isInstanceOf*(v, T: untyped): untyped =
+  return block:
+    if ProtocolTable.hasKey(T.strVal):
+      quote do:
+        when compiles(`v`.toProtocol()):
+          `v`.toProtocol().type is `T`
+        else:
+          false
+    else:
+      quote do:
+        `v`.type is `T`
diff --git a/tests/is_instanceof.nim b/tests/is_instanceof.nim
new file mode 100644
index 0000000..b526d8c
--- /dev/null
+++ b/tests/is_instanceof.nim
@@ -0,0 +1,28 @@
+discard """
+  action: "compile"
+"""
+
+import
+  std/unittest,
+  ../src/oolib
+
+protocol Readable:
+  var text: string
+
+class Book impl Readable:
+  var title: string
+  var text: string = ""
+
+class Human:
+  var name: string
+
+let
+  book = Book.new(title = "Autobiography")
+  me = Human.new("Me")
+
+check book.isInstanceOf(Readable)
+check book.isInstanceOf(Book)
+check me.isInstanceOf(Human)
+
+check not me.isInstanceOf(Readable)
+check not book.isInstanceOf(Human)

From 7c7f1033147bdd44349c8f5ddcad067314302df7 Mon Sep 17 00:00:00 2001
From: Glasses-Neo <meganeo.programmer@gmail.com>
Date: Tue, 5 Mar 2024 02:29:34 +0900
Subject: [PATCH 2/2] :books: Edit CHANGELOG

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3801169..71ce317 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Added
+- `isInstanceOf` to check whether a variable can be converted to a certain protocol
 
 ## [v0.7.1] -2023-10-21
 ### Fixed