std::chrono overloads for .timeout() and .delay() (#30)

Add convenience overloads accepting durations from the C++ Standard Library.

docs/qtpromise/qpromise/delay.md

@@ -20,3 +20,31 @@ auto output = input.delay(2000).then([](int res) {
     // called 2 seconds after `input` is fulfilled
 });
 ```
+
+---
+
+*Since: 0.6.0*
+
+```cpp
+QPromise<T>::delay(std::chrono::milliseconds msec) -> QPromise<T>
+```
+
+This is a convenience overload accepting [durations from the C++ Standard Library](https://en.cppreference.com/w/cpp/chrono/duration).
+
+```cpp
+QPromise<int> input = {...}
+auto output = input.delay(std::chrono::seconds{2}).then([](int res) {
+    // called 2 seconds after `input` is fulfilled
+});
+```
+
+C++14 alternative:
+
+```cpp
+using namespace std::chrono_literals;
+
+QPromise<int> input = {...}
+auto output = input.delay(2s).then([](int res) {
+    // called 2 seconds after `input` is fulfilled
+});
+```

docs/qtpromise/qpromise/timeout.md

@@ -25,3 +25,39 @@ auto output = input.timeout(2000)
         // operation timed out!
     });
 ```
+
+---
+
+*Since: 0.6.0*
+
+```cpp
+QPromise<T>::timeout(std::chrono::milliseconds msec, any error = QPromiseTimeoutException) -> QPromise<T>
+```
+
+This is a convenience overload accepting [durations from the C++ Standard Library](https://en.cppreference.com/w/cpp/chrono/duration).
+
+```cpp
+QPromise<int> input = {...}
+auto output = input.timeout(std::chrono::seconds{2})
+    .then([](int res) {
+        // operation succeeded within 2 seconds
+    })
+    .fail([](const QPromiseTimeoutException& error) {
+        // operation timed out!
+    });
+```
+
+C++14 alternative:
+
+```cpp
+using namespace std::chrono_literals; 
+
+QPromise<int> input = {...}
+auto output = input.timeout(2s)
+    .then([](int res) {
+        // operation succeeded within 2 seconds
+    })
+    .fail([](const QPromiseTimeoutException& error) {
+        // operation timed out!
+    });
+```

src/qtpromise/qpromise.h

@@ -16,6 +16,9 @@
 // Qt
 #include <QExplicitlySharedDataPointer>
 
+// C++ Standard Library
+#include <chrono>
+
 namespace QtPromise {
 
 template <typename T>
@@ -73,7 +76,12 @@ public:
     template <typename E = QPromiseTimeoutException>
     inline QPromise<T> timeout(int msec, E&& error = E()) const;
 
+    template <typename E = QPromiseTimeoutException>
+    inline QPromise<T> timeout(std::chrono::milliseconds msec, E&& error = E()) const;
+
     inline QPromise<T> delay(int msec) const;    
+    inline QPromise<T> delay(std::chrono::milliseconds msec) const;
+
     inline QPromise<T> wait() const;
 
 public: // STATIC

src/qtpromise/qpromise.inl

@@ -131,6 +131,13 @@ inline QPromise<T> QPromiseBase<T>::timeout(int msec, E&& error) const
     });
 }
 
+template <typename T>
+template <typename E>
+inline QPromise<T> QPromiseBase<T>::timeout(std::chrono::milliseconds msec, E&& error) const
+{
+    return timeout(static_cast<int>(msec.count()), std::forward<E>(error));
+}
+
 template <typename T>
 inline QPromise<T> QPromiseBase<T>::delay(int msec) const
 {
@@ -141,6 +148,12 @@ inline QPromise<T> QPromiseBase<T>::delay(int msec) const
     });
 }
 
+template<typename T>
+inline QPromise<T> QPromiseBase<T>::delay(std::chrono::milliseconds msec) const
+{
+    return delay(static_cast<int>(msec.count()));
+}
+
 template <typename T>
 inline QPromise<T> QPromiseBase<T>::wait() const
 {

tests/auto/qtpromise/qpromise/delay/tst_delay.cpp

@@ -13,6 +13,9 @@
 // Qt
 #include <QtTest>
 
+// C++ Standard Library
+#include <chrono>
+
 using namespace QtPromise;
 
 class tst_qpromise_delay : public QObject
@@ -22,6 +25,9 @@ class tst_qpromise_delay : public QObject
 private Q_SLOTS:
     void fulfilled();
     void rejected();
+
+    void fulfilledStdChrono();
+    void rejectedStdChrono();
 };
 
 QTEST_MAIN(tst_qpromise_delay)
@@ -63,3 +69,40 @@ void tst_qpromise_delay::rejected()
     QCOMPARE(p.isRejected(), true);
     QVERIFY(elapsed <= 10);
 }
+
+void tst_qpromise_delay::fulfilledStdChrono()
+{
+    QElapsedTimer timer;
+    qint64 elapsed = -1;
+
+    timer.start();
+
+    auto p = QPromise<int>::resolve(42).delay(std::chrono::seconds{1}).finally([&]() {
+        elapsed = timer.elapsed();
+    });
+
+    QCOMPARE(waitForValue(p, -1), 42);
+    QCOMPARE(p.isFulfilled(), true);
+
+    // Qt::CoarseTimer (default) Coarse timers try to
+    // keep accuracy within 5% of the desired interval.
+    // Require accuracy within 6% for passing the test.
+    QVERIFY(elapsed >= static_cast<qint64>(1000 * 0.94));
+    QVERIFY(elapsed <= static_cast<qint64>(1000 * 1.06));
+}
+
+void tst_qpromise_delay::rejectedStdChrono()
+{
+    QElapsedTimer timer;
+    qint64 elapsed = -1;
+
+    timer.start();
+
+    auto p = QPromise<int>::reject(QString("foo")).delay(std::chrono::seconds{1}).finally([&]() {
+        elapsed = timer.elapsed();
+    });
+
+    QCOMPARE(waitForError(p, QString()), QString("foo"));
+    QCOMPARE(p.isRejected(), true);
+    QVERIFY(elapsed <= 10);
+}

tests/auto/qtpromise/qpromise/timeout/tst_timeout.cpp

@@ -13,6 +13,9 @@
 // Qt
 #include <QtTest>
 
+// C++ Standard Library
+#include <chrono>
+
 using namespace QtPromise;
 
 class tst_qpromise_timeout : public QObject
@@ -23,6 +26,10 @@ private Q_SLOTS:
     void fulfilled();
     void rejected();
     void timeout();
+
+    void fulfilledStdChrono();
+    void rejectedStdChrono();
+    void timeoutStdChrono();
 };
 
 QTEST_MAIN(tst_qpromise_timeout)
@@ -100,3 +107,76 @@ void tst_qpromise_timeout::timeout()
     QVERIFY(elapsed >= static_cast<qint64>(2000 * 0.94));
     QVERIFY(elapsed <= static_cast<qint64>(2000 * 1.06));
 }
+
+void tst_qpromise_timeout::fulfilledStdChrono()
+{
+    QElapsedTimer timer;
+    qint64 elapsed = -1;
+
+    timer.start();
+
+    auto p = QPromise<int>([](const QPromiseResolve<int>& resolve) {
+        QTimer::singleShot(1000, [=]() {
+            resolve(42);
+        });
+    }).timeout(std::chrono::seconds{2}).finally([&]() {
+        elapsed = timer.elapsed();
+    });
+
+    QCOMPARE(waitForValue(p, -1), 42);
+    QCOMPARE(p.isFulfilled(), true);
+    QVERIFY(elapsed < 2000);
+}
+
+void tst_qpromise_timeout::rejectedStdChrono()
+{
+    QElapsedTimer timer;
+    qint64 elapsed = -1;
+
+    timer.start();
+
+    auto p = QPromise<int>([](const QPromiseResolve<int>&, const QPromiseReject<int>& reject) {
+        QTimer::singleShot(1000, [=]() {
+            reject(QString("foo"));
+        });
+    }).timeout(std::chrono::seconds{2}).finally([&]() {
+        elapsed = timer.elapsed();
+    });
+
+
+    QCOMPARE(waitForError(p, QString()), QString("foo"));
+    QCOMPARE(p.isRejected(), true);
+    QVERIFY(elapsed < 2000);
+}
+
+void tst_qpromise_timeout::timeoutStdChrono()
+{
+    QElapsedTimer timer;
+    qint64 elapsed = -1;
+    bool failed = false;
+
+    timer.start();
+
+    auto p = QPromise<int>([](const QPromiseResolve<int>& resolve) {
+        QTimer::singleShot(4000, [=]() {
+            resolve(42);
+        });
+    }).timeout(std::chrono::seconds{2}).finally([&]() {
+        elapsed = timer.elapsed();
+    });
+
+    p.fail([&](const QPromiseTimeoutException&) {
+        failed = true;
+        return -1;
+    }).wait();
+
+    QCOMPARE(waitForValue(p, -1), -1);
+    QCOMPARE(p.isRejected(), true);
+    QCOMPARE(failed, true);
+
+    // Qt::CoarseTimer (default) Coarse timers try to
+    // keep accuracy within 5% of the desired interval.
+    // Require accuracy within 6% for passing the test.
+    QVERIFY(elapsed >= static_cast<qint64>(2000 * 0.94));
+    QVERIFY(elapsed <= static_cast<qint64>(2000 * 1.06));
+}