1 files changed, 299 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp
new file mode 100644
index 0000000000..2fa73bac46
--- /dev/null
+++ b/src/corelib/doc/snippets/code/src_corelib_tools_qhash.cpp
@@ -0,0 +1,299 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+QHash<QString, int> hash;
+//! [0]
+
+
+//! [1]
+hash["one"] = 1;
+hash["three"] = 3;
+hash["seven"] = 7;
+//! [1]
+
+
+//! [2]
+hash.insert("twelve", 12);
+//! [2]
+
+
+//! [3]
+int num1 = hash["thirteen"];
+int num2 = hash.value("thirteen");
+//! [3]
+
+
+//! [4]
+int timeout = 30;
+if (hash.contains("TIMEOUT"))
+    timeout = hash.value("TIMEOUT");
+//! [4]
+
+
+//! [5]
+int timeout = hash.value("TIMEOUT", 30);
+//! [5]
+
+
+//! [6]
+// WRONG
+QHash<int, QWidget *> hash;
+...
+for (int i = 0; i < 1000; ++i) {
+    if (hash[i] == okButton)
+        cout << "Found button at index " << i << endl;
+}
+//! [6]
+
+
+//! [7]
+QHashIterator<QString, int> i(hash);
+while (i.hasNext()) {
+    i.next();
+    cout << i.key() << ": " << i.value() << endl;
+}
+//! [7]
+
+
+//! [8]
+QHash<QString, int>::const_iterator i = hash.constBegin();
+while (i != hash.constEnd()) {
+    cout << i.key() << ": " << i.value() << endl;
+    ++i;
+}
+//! [8]
+
+
+//! [9]
+hash.insert("plenty", 100);
+hash.insert("plenty", 2000);
+// hash.value("plenty") == 2000
+//! [9]
+
+
+//! [10]
+QList<int> values = hash.values("plenty");
+for (int i = 0; i < values.size(); ++i)
+    cout << values.at(i) << endl;
+//! [10]
+
+
+//! [11]
+QHash<QString, int>::iterator i = hash.find("plenty");
+while (i != hash.end() && i.key() == "plenty") {
+    cout << i.value() << endl;
+    ++i;
+}
+//! [11]
+
+
+//! [12]
+QHash<QString, int> hash;
+...
+foreach (int value, hash)
+    cout << value << endl;
+//! [12]
+
+
+//! [13]
+#ifndef EMPLOYEE_H
+#define EMPLOYEE_H
+
+class Employee
+{
+public:
+    Employee() {}
+    Employee(const QString &name, const QDate &dateOfBirth);
+    ...
+
+private:
+    QString myName;
+    QDate myDateOfBirth;
+};
+
+inline bool operator==(const Employee &e1, const Employee &e2)
+{
+    return e1.name() == e2.name()
+           && e1.dateOfBirth() == e2.dateOfBirth();
+}
+
+inline uint qHash(const Employee &key, uint seed)
+{
+    return qHash(key.name(), seed) ^ key.dateOfBirth().day();
+}
+
+#endif // EMPLOYEE_H
+//! [13]
+
+
+//! [14]
+QHash<QString, int> hash;
+hash.reserve(20000);
+for (int i = 0; i < 20000; ++i)
+    hash.insert(keys[i], values[i]);
+//! [14]
+
+
+//! [15]
+QHash<QObject *, int> objectHash;
+...
+QHash<QObject *, int>::iterator i = objectHash.find(obj);
+while (i != objectHash.end() && i.key() == obj) {
+    if (i.value() == 0) {
+        i = objectHash.erase(i);
+    } else {
+        ++i;
+    }
+}
+//! [15]
+
+
+//! [16]
+QHash<QString, int> hash;
+...
+QHash<QString, int>::const_iterator i = hash.find("HDR");
+while (i != hash.end() && i.key() == "HDR") {
+    cout << i.value() << endl;
+    ++i;
+}
+//! [16]
+
+
+//! [17]
+QHash<QString, int> hash;
+hash.insert("January", 1);
+hash.insert("February", 2);
+...
+hash.insert("December", 12);
+
+QHash<QString, int>::iterator i;
+for (i = hash.begin(); i != hash.end(); ++i)
+    cout << i.key() << ": " << i.value() << endl;
+//! [17]
+
+
+//! [18]
+QHash<QString, int>::iterator i;
+for (i = hash.begin(); i != hash.end(); ++i)
+    i.value() += 2;
+//! [18]
+
+
+//! [19]
+QHash<QString, int>::iterator i = hash.begin();
+while (i != hash.end()) {
+    if (i.key().startsWith("_"))
+        i = hash.erase(i);
+    else
+        ++i;
+}
+//! [19]
+
+
+//! [20]
+QHash<QString, int>::iterator i = hash.begin();
+while (i != hash.end()) {
+    QHash<QString, int>::iterator prev = i;
+    ++i;
+    if (prev.key().startsWith("_"))
+        hash.erase(prev);
+}
+//! [20]
+
+
+//! [21]
+// WRONG
+while (i != hash.end()) {
+    if (i.key().startsWith("_"))
+        hash.erase(i);
+    ++i;
+}
+//! [21]
+
+
+//! [22]
+if (i.key() == "Hello")
+    i.value() = "Bonjour";
+//! [22]
+
+
+//! [23]
+QHash<QString, int> hash;
+hash.insert("January", 1);
+hash.insert("February", 2);
+...
+hash.insert("December", 12);
+
+QHash<QString, int>::const_iterator i;
+for (i = hash.constBegin(); i != hash.constEnd(); ++i)
+    cout << i.key() << ": " << i.value() << endl;
+//! [23]
+
+
+//! [24]
+QMultiHash<QString, int> hash1, hash2, hash3;
+
+hash1.insert("plenty", 100);
+hash1.insert("plenty", 2000);
+// hash1.size() == 2
+
+hash2.insert("plenty", 5000);
+// hash2.size() == 1
+
+hash3 = hash1 + hash2;
+// hash3.size() == 3
+//! [24]
+
+
+//! [25]
+QList<int> values = hash.values("plenty");
+for (int i = 0; i < values.size(); ++i)
+    cout << values.at(i) << endl;
+//! [25]
+
+
+//! [26]
+QMultiHash<QString, int>::iterator i = hash.find("plenty");
+while (i != hash.end() && i.key() == "plenty") {
+    cout << i.value() << endl;
+    ++i;
+}
+//! [26]