Simplify the saving & loading of a setting

Remove excessive usage of constexpr.

src/gui/addnewtorrentdialog.cpp

@@ -44,7 +44,6 @@
 #include "base/net/downloadmanager.h"
 #include "base/preferences.h"
 #include "base/settingsstorage.h"
-#include "base/settingvalue.h"
 #include "base/torrentfileguard.h"
 #include "base/unicodestrings.h"
 #include "base/utils/fs.h"
@@ -79,8 +78,8 @@ namespace
     }
 }
 
-constexpr int AddNewTorrentDialog::minPathHistoryLength;
-constexpr int AddNewTorrentDialog::maxPathHistoryLength;
+const int AddNewTorrentDialog::minPathHistoryLength;
+const int AddNewTorrentDialog::maxPathHistoryLength;
 
 AddNewTorrentDialog::AddNewTorrentDialog(const BitTorrent::AddTorrentParams &inParams, QWidget *parent)
     : QDialog(parent)
@@ -186,30 +185,21 @@ void AddNewTorrentDialog::setTopLevel(bool value)
 
 int AddNewTorrentDialog::savePathHistoryLength()
 {
-    return savePathHistoryLengthSetting();
+    const int defaultHistoryLength = 8;
+    const int value = settings()->loadValue(KEY_SAVEPATHHISTORYLENGTH, defaultHistoryLength).toInt();
+    return qBound(minPathHistoryLength, value, maxPathHistoryLength);
 }
 
 void AddNewTorrentDialog::setSavePathHistoryLength(int value)
 {
-    Q_ASSERT(value >= minPathHistoryLength);
-    Q_ASSERT(value <= maxPathHistoryLength);
+    const int clampedValue = qBound(minPathHistoryLength, value, maxPathHistoryLength);
     const int oldValue = savePathHistoryLength();
-    if (oldValue != value) {
-        savePathHistoryLengthSetting() = value;
-        settings()->storeValue(KEY_SAVEPATHHISTORY,
-                               QStringList(settings()->loadValue(KEY_SAVEPATHHISTORY).toStringList().mid(0, value)));
-    }
-}
+    if (clampedValue == oldValue)
+        return;
 
-CachedSettingValue<int> &AddNewTorrentDialog::savePathHistoryLengthSetting()
-{
-    const int defaultHistoryLength = 8;
-    static CachedSettingValue<int> setting(KEY_SAVEPATHHISTORYLENGTH.toUtf8().constData(), defaultHistoryLength,
-        [](int v)
-        {
-            return std::max(minPathHistoryLength, std::min(maxPathHistoryLength, v));
-        });
-    return setting;
+    settings()->storeValue(KEY_SAVEPATHHISTORYLENGTH, clampedValue);
+    settings()->storeValue(KEY_SAVEPATHHISTORY
+        , QStringList(settings()->loadValue(KEY_SAVEPATHHISTORY).toStringList().mid(0, clampedValue)));
 }
 
 void AddNewTorrentDialog::loadState()

src/gui/addnewtorrentdialog.h

@@ -51,15 +51,14 @@ namespace Ui
 class PropListDelegate;
 class TorrentContentFilterModel;
 class TorrentFileGuard;
-template <typename T> class CachedSettingValue;
 
 class AddNewTorrentDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    static constexpr int minPathHistoryLength = 0;
-    static constexpr int maxPathHistoryLength = 99;
+    static const int minPathHistoryLength = 0;
+    static const int maxPathHistoryLength = 99;
 
     ~AddNewTorrentDialog();
 
@@ -103,7 +102,6 @@ private:
     void setupTreeview();
     void setCommentText(const QString &str) const;
     void setSavePath(const QString &newPath);
-    static CachedSettingValue<int> &savePathHistoryLengthSetting();
 
     void showEvent(QShowEvent *event) override;