Add a simple qHash for QVariant

nyalldawson · nyalldawson · commit 13b44722cadb · 2017-04-26T09:58:21.000+10:00
Allows creation of QSet&lt;QVariant&gt;
diff --git a/src/core/qgis.cpp b/src/core/qgis.cpp
@@ -222,3 +222,49 @@ QString qgsVsiPrefix( const QString &path )
   else
     return QLatin1String( "" );
 }
+
+uint qHash( const QVariant &variant )
+{
+  if ( !variant.isValid() || variant.isNull() )
+    return -1;
+
+  switch ( variant.type() )
+  {
+    case QVariant::Int:
+      return qHash( variant.toInt() );
+    case QVariant::UInt:
+      return qHash( variant.toUInt() );
+    case QVariant::Bool:
+      return qHash( variant.toBool() );
+    case QVariant::Double:
+      return qHash( variant.toDouble() );
+    case QVariant::LongLong:
+      return qHash( variant.toLongLong() );
+    case QVariant::ULongLong:
+      return qHash( variant.toULongLong() );
+    case QVariant::String:
+      return qHash( variant.toString() );
+    case QVariant::Char:
+      return qHash( variant.toChar() );
+    case QVariant::List:
+      return qHash( variant.toList() );
+    case QVariant::StringList:
+      return qHash( variant.toStringList() );
+    case QVariant::ByteArray:
+      return qHash( variant.toByteArray() );
+    case QVariant::Date:
+      return qHash( variant.toDate() );
+    case QVariant::Time:
+      return qHash( variant.toTime() );
+    case QVariant::DateTime:
+      return qHash( variant.toDateTime() );
+    case QVariant::Url:
+    case QVariant::Locale:
+    case QVariant::RegExp:
+      return qHash( variant.toString() );
+    default:
+      return -1;
+  }
+
+  return -1;
+}
diff --git a/src/core/qgis.h b/src/core/qgis.h
@@ -180,6 +180,9 @@ template<class Object> inline QgsSignalBlocker<Object> whileBlocking( Object *ob
   return QgsSignalBlocker<Object>( object );
 }
 
+//! Hash for QVariant
+uint qHash( const QVariant &variant );
+
 //! Returns a string representation of a double
 //! \param a double value
 //! \param precision number of decimal places to retain

Original file line number	Diff line number	Diff line change
`@@ -180,6 +180,9 @@ template<class Object> inline QgsSignalBlocker<Object> whileBlocking( Object *ob`
`180`	`180`	`return QgsSignalBlocker<Object>( object );`
`181`	`181`	`}`
`182`	`182`
	`183`	`+//! Hash for QVariant`
	`184`	`+uint qHash( const QVariant &variant );`
	`185`	`+`
`183`	`186`	`//! Returns a string representation of a double`
`184`	`187`	`//! \param a double value`
`185`	`188`	`//! \param precision number of decimal places to retain`