From 60076c08560c414bf1438cb5e89ea02f5690aab2 Mon Sep 17 00:00:00 2001
From: Hourier <66951241+Hourier@users.noreply.github.com>
Date: Mon, 1 May 2023 22:07:11 +0900
Subject: [PATCH] =?utf8?q?[Refactor]=20mysqrt()=20=E3=82=92=E5=89=8A?=
 =?utf8?q?=E9=99=A4=E3=81=97=E3=80=81std::sqrt=20=E3=81=AB=E5=B7=AE?=
 =?utf8?q?=E3=81=97=E6=9B=BF=E3=81=88=E3=81=9F?=
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
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---
 src/monster/monster-list.cpp |  3 ++-
 src/term/z-util.cpp          | 39 ---------------------------------------
 src/term/z-util.h            |  1 -
 3 files changed, 2 insertions(+), 41 deletions(-)

diff --git a/src/monster/monster-list.cpp b/src/monster/monster-list.cpp
index d3a3a442c..734868d6d 100644
--- a/src/monster/monster-list.cpp
+++ b/src/monster/monster-list.cpp
@@ -45,6 +45,7 @@
 #include "util/probability-table.h"
 #include "view/display-messages.h"
 #include "world/world.h"
+#include <cmath>
 #include <iterator>
 
 #define HORDE_NOGOOD 0x01 /*!< (未実装フラグ)HORDE生成でGOODなモンスターの生成を禁止する？ */
@@ -94,7 +95,7 @@ MONSTER_IDX m_pop(FloorType *floor_ptr)
 MonsterRaceId get_mon_num(PlayerType *player_ptr, DEPTH min_level, DEPTH max_level, BIT_FLAGS option)
 {
     /* town max_level : same delay as 10F, no nasty mons till day18 */
-    auto delay = mysqrt(max_level * 10000L) + (max_level * 5);
+    auto delay = static_cast<int>(std::sqrt(max_level * 10000)) + (max_level * 5);
     if (!max_level) {
         delay = 360;
     }
diff --git a/src/term/z-util.cpp b/src/term/z-util.cpp
index 88f8e161c..a48363221 100644
--- a/src/term/z-util.cpp
+++ b/src/term/z-util.cpp
@@ -303,42 +303,3 @@ int count_bits(BIT_FLAGS x)
 
     return n;
 }
-
-/*!
- * @brief 平方根を切り捨て整数で返す
- * @param n 数値
- * @return 平方根
- */
-int mysqrt(int n)
-{
-    int tmp = n >> 1;
-    int tasu = 10;
-    int kaeriti = 1;
-
-    if (!tmp) {
-        if (n) {
-            return 1;
-        } else {
-            return 0;
-        }
-    }
-
-    while (tmp) {
-        if ((n / tmp) < tmp) {
-            tmp >>= 1;
-        } else {
-            break;
-        }
-    }
-    kaeriti = tmp;
-    while (tasu) {
-        if ((n / tmp) < tmp) {
-            tasu--;
-            tmp = kaeriti;
-        } else {
-            kaeriti = tmp;
-            tmp += tasu;
-        }
-    }
-    return kaeriti;
-}
diff --git a/src/term/z-util.h b/src/term/z-util.h
index 54a2aedf3..81fa0e380 100644
--- a/src/term/z-util.h
+++ b/src/term/z-util.h
@@ -73,4 +73,3 @@ void s64b_div(int32_t *A1, uint32_t *A2, int32_t B1, uint32_t B2);
 void s64b_mod(int32_t *A1, uint32_t *A2, int32_t B1, uint32_t B2);
 
 int count_bits(BIT_FLAGS x);
-int mysqrt(int n);
-- 
2.11.0