utilities functions

liblattedock/extras.cpp

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+#include "extras.h"

liblattedock/extras.h

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+#ifndef EXTRAS_H
+#define EXTRAS_H
+
+#include <QObject>
+#include <QString>
+#include <QStringBuilder>
+#include <QRect>
+#include <QMetaEnum>
+#include <QMetaType>
+
+#include <Plasma>
+
+#include <type_traits>
+#include <numeric>
+#include <memory>
+
+#if __GLIBCXX__ <= 20150623
+namespace std {
+template<class T, class... Args>
+unique_ptr<T> make_unique(Args &&... args)
+{
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+}
+#endif
+
+/*!
+ * @brief convert a QRect to a QString with format `(<x>, <y>) <width>x<height>`
+ */
+inline QString qRectToStr(const QRect &r)
+{
+    return "(" % QString::number(r.x()) % ", " % QString::number(r.y()) % ") "
+           % QString::number(r.width()) % "x" % QString::number(r.height());
+}
+
+/*!
+ * @brief convert a `Q_ENUM` to c-string
+ */
+template<typename EnumType>
+inline const char *qEnumToStr(EnumType value)
+{
+    return QMetaEnum::fromType<EnumType>().valueToKey(value);
+}
+
+/*!
+ * @brief convert a `Q_ENUMS` of `Plasma::Types::Location` to c-string
+ */
+inline const char *qEnumToStr(Plasma::Types::Location Enum)
+{
+    static const int Index = Plasma::Types::staticMetaObject.indexOfEnumerator("Location");
+    return Plasma::Types::staticMetaObject.enumerator(Index).valueToKey(Enum);
+}
+
+/*!
+ * @brief convert a `Q_ENUMS` of `Plasma::Types::FormFactor` to c-string
+ */
+inline const char *qEnumToStr(Plasma::Types::FormFactor Enum)
+{
+    static const int Index = Plasma::Types::staticMetaObject.indexOfEnumerator("FormFactor");
+    return Plasma::Types::staticMetaObject.enumerator(Index).valueToKey(Enum);
+}
+
+/*!
+ * @brief machine epsilon
+ */
+template<class T>
+typename std::enable_if<!std::is_integral<T>(), bool>::type almost_equal(T x, T y, int ulp)
+{
+    return std::abs(x - y) < std::numeric_limits<T>::epsilon() * std::abs(x + y) * ulp
+           || std::abs(x - y) < std::numeric_limits<T>::min();
+}
+
+#endif // EXTRAS_H