e9a64615c8
Unlike Qt5, the Qt4 signals implementation doesn't allow a signal to be directly connected to a c++ lambda expression. Work around this by defining a Callback QObject with a virtual method that can forward calls to a closure. The Qt4 error was reported by Patrick Strateman <patrick.strateman@gmail.com> in https://github.com/bitcoin/bitcoin/pull/10039#issuecomment-289248763
31 lines
535 B
C++
31 lines
535 B
C++
#ifndef BITCOIN_QT_CALLBACK_H
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#define BITCOIN_QT_CALLBACK_H
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#include <QObject>
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class Callback : public QObject
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{
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Q_OBJECT
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public Q_SLOTS:
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virtual void call() = 0;
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};
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template <typename F>
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class FunctionCallback : public Callback
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{
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F f;
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public:
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FunctionCallback(F f_) : f(std::move(f_)) {}
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~FunctionCallback() override {}
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void call() override { f(this); }
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};
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template <typename F>
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FunctionCallback<F>* makeCallback(F f)
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{
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return new FunctionCallback<F>(std::move(f));
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}
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#endif // BITCOIN_QT_CALLBACK_H
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