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   1 #ifndef VARIANTPROMISE_H
   2 #define VARIANTPROMISE_H
   3
   4 #include <QtCore>
   5
   6 class VariantPromise : public QObject {
   7     Q_OBJECT
   8
   9 public:
  10     explicit VariantPromise(QObject *parent = nullptr) : QObject(parent) {
  11         connect(this, &VariantPromise::resolve, this, &QObject::deleteLater);
  12         connect(this, &VariantPromise::reject, this, &QObject::deleteLater);
  13     };
  14
  15     template <typename Function> VariantPromise &then(Function func) {
  16         connect(this, &VariantPromise::resolve, this, func);
  17         return *this;
  18     }
  19     template <typename Function> VariantPromise &onFailed(Function func) {
  20         connect(this, &VariantPromise::reject, this, func);
  21         return *this;
  22     }
  23     template <typename Function> VariantPromise &finally(Function func) {
  24         connect(this, &VariantPromise::destroyed, this, func);
  25         return *this;
  26     }
  27
  28 signals:
  29     void resolve(QVariant result);
  30     void reject(const QString &message);
  31 };
  32
  33 #endif // VARIANTPROMISE_H