HSTS policy - fix API

API-review follow-up:

1. make a ctor explicit
2. add swap member-function
3. make move-assignment inlined
4. make comparison operators non-members
5. make d_ptr QSharedDataPointer (and private implementation - QSharedData).

Change-Id: I3257ca03cccd0f1254c9b95461752911359352a5
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/access/qhstspolicy.cpp

@@ -63,7 +63,7 @@ QT_BEGIN_NAMESPACE
     \sa QNetworkAccessManager::setStrictTransportSecurityEnabled()
 */
 
-class QHstsPolicyPrivate
+class QHstsPolicyPrivate : public QSharedData
 {
 public:
     QUrl url;
@@ -77,6 +77,15 @@ public:
     }
 };
 
+/*!
+    Returns \c true if the two policies have the same host and expiration date
+    while agreeing on whether to include or exclude subdomains.
+*/
+bool operator==(const QHstsPolicy &lhs, const QHstsPolicy &rhs)
+{
+    return *lhs.d == *rhs.d;
+}
+
 /*!
     Constructs an invalid (expired) policy with empty host name and subdomains
     not included.
@@ -121,17 +130,7 @@ QHstsPolicy::~QHstsPolicy()
 */
 QHstsPolicy &QHstsPolicy::operator=(const QHstsPolicy &other)
 {
-    *d = *other.d;
+    d = other.d;
-    return *this;
-}
-
-
-/*!
-    Move-assignment operator.
-*/
-QHstsPolicy &QHstsPolicy::operator=(QHstsPolicy &&other) Q_DECL_NOTHROW
-{
-    qSwap(d, other.d);
     return *this;
 }
 
@@ -195,15 +194,6 @@ bool QHstsPolicy::includesSubDomains() const
     return d->includeSubDomains;
 }
 
-/*!
-    Returns \c true if the two policies have the same host and expiration date
-    while agreeing on whether to include or exclude subdomains.
-*/
-bool QHstsPolicy::operator==(const QHstsPolicy &other) const
-{
-    return *d == *other.d;
-}
-
 /*!
     Return \c true if this policy has a valid expiration date and this date
     is greater than QDateTime::currentGetDateTimeUtc().

src/network/access/qhstspolicy.h

@@ -42,7 +42,7 @@
 
 #include <QtNetwork/qtnetworkglobal.h>
 
-#include <QtCore/qscopedpointer.h>
+#include <QtCore/qshareddata.h>
 #include <QtCore/qurl.h>
 
 QT_BEGIN_NAMESPACE
@@ -55,13 +55,15 @@ class Q_NETWORK_EXPORT QHstsPolicy
 public:
 
     QHstsPolicy();
-    QHstsPolicy(const QDateTime &expiry, bool includeSubDomains, const QString &host,
+    explicit QHstsPolicy(const QDateTime &expiry, bool includeSubDomains, const QString &host,
-                QUrl::ParsingMode mode = QUrl::DecodedMode);
+                         QUrl::ParsingMode mode = QUrl::DecodedMode);
     QHstsPolicy(const QHstsPolicy &rhs);
     QHstsPolicy &operator=(const QHstsPolicy &rhs);
-    QHstsPolicy &operator=(QHstsPolicy &&rhs) Q_DECL_NOTHROW;
+    QHstsPolicy &operator=(QHstsPolicy &&other) Q_DECL_NOTHROW { swap(other); return *this; }
     ~QHstsPolicy();
 
+    void swap(QHstsPolicy &other) Q_DECL_NOTHROW { qSwap(d, other.d); }
+
     void setHost(const QString &host, QUrl::ParsingMode mode = QUrl::DecodedMode);
     QString host(QUrl::ComponentFormattingOptions options = QUrl::FullyDecoded) const;
     void setExpiry(const QDateTime &expiry);
@@ -69,14 +71,25 @@ public:
     void setIncludesSubDomains(bool include);
     bool includesSubDomains() const;
 
-    bool operator==(const QHstsPolicy &rhs) const;
     bool isExpired() const;
 
 private:
 
-    QScopedPointer<QHstsPolicyPrivate> d;
+    QSharedDataPointer<QHstsPolicyPrivate> d;
+
+    friend Q_NETWORK_EXPORT bool operator==(const QHstsPolicy &lhs, const QHstsPolicy &rhs);
 };
 
+Q_DECLARE_SHARED(QHstsPolicy)
+
+Q_NETWORK_EXPORT bool operator==(const QHstsPolicy &lhs, const QHstsPolicy &rhs);
+
+inline bool operator!=(const QHstsPolicy &lhs, const QHstsPolicy &rhs)
+{
+    return !(lhs == rhs);
+}
+
+
 QT_END_NAMESPACE
 
 #endif // QHSTSPOLICY_H