From 7a533d4667dd0a0b5babf1debf7e2f37c9537bf0 Mon Sep 17 00:00:00 2001
From: Him188 <Him188@mamoe.net>
Date: Sun, 20 Sep 2020 13:56:12 +0800
Subject: [PATCH] Use lazy for SemVersion.toString

---
 .../mamoe/mirai/console/util/SemVersion.kt    | 27 +++++++++----------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/SemVersion.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/SemVersion.kt
index f07b8d5b9..939fe7ea6 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/SemVersion.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/SemVersion.kt
@@ -188,23 +188,22 @@ public data class SemVersion internal constructor(
     }
 
     @Transient
-    private var toString: String? = null // For cache.
-    override fun toString(): String {
-        return toString ?: kotlin.run {
-            buildString {
-                mainVersion.joinTo(this, ".")
-                identifier?.let { identifier ->
-                    append('-')
-                    append(identifier)
-                }
-                metadata?.let { metadata ->
-                    append('+')
-                    append(metadata)
-                }
-            }.also { toString = it }
+    private val toString: String by lazy(LazyThreadSafetyMode.NONE) {
+        buildString {
+            mainVersion.joinTo(this, ".")
+            identifier?.let { identifier ->
+                append('-')
+                append(identifier)
+            }
+            metadata?.let { metadata ->
+                append('+')
+                append(metadata)
+            }
         }
     }
 
+    override fun toString(): String = toString
+
     /**
      * 将 [SemVersion] 转为 Kotlin data class 风格的 [String]
      */