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28 | |
29 | #include <QtTest/QtTest> |
30 | #include <QtCore/QScopedValueRollback> |
31 | |
32 | /*! |
33 | \class tst_QScopedValueRollback |
34 | \internal |
35 | \since 4.8 |
36 | \brief Tests class QScopedValueRollback. |
37 | |
38 | */ |
39 | class tst_QScopedValueRollback : public QObject |
40 | { |
41 | Q_OBJECT |
42 | |
43 | private Q_SLOTS: |
44 | void leavingScope(); |
45 | void leavingScopeAfterCommit(); |
46 | void rollbackToPreviousCommit(); |
47 | void exceptions(); |
48 | void earlyExitScope(); |
49 | void moveOnly(); |
50 | private: |
51 | void earlyExitScope_helper(int exitpoint, int &member); |
52 | }; |
53 | |
54 | void tst_QScopedValueRollback::leavingScope() |
55 | { |
56 | int i = 0; |
57 | bool b = false; |
58 | bool b2 = false; |
59 | QString s("This is useful" ); |
60 | |
61 | //test rollback on going out of scope |
62 | { |
63 | QScopedValueRollback<int> ri(i); |
64 | QScopedValueRollback<bool> rb(b); |
65 | QScopedValueRollback<bool> rb2(b2, true); |
66 | QScopedValueRollback<QString> rs(s); |
67 | QCOMPARE(b, false); |
68 | QCOMPARE(b2, true); |
69 | QCOMPARE(i, 0); |
70 | QCOMPARE(s, QString("This is useful" )); |
71 | b = true; |
72 | i = 1; |
73 | s = "Useless" ; |
74 | QCOMPARE(b, true); |
75 | QCOMPARE(i, 1); |
76 | QCOMPARE(s, QString("Useless" )); |
77 | } |
78 | QCOMPARE(b, false); |
79 | QCOMPARE(b2, false); |
80 | QCOMPARE(i, 0); |
81 | QCOMPARE(s, QString("This is useful" )); |
82 | } |
83 | |
84 | void tst_QScopedValueRollback::leavingScopeAfterCommit() |
85 | { |
86 | int i = 0; |
87 | bool b = false; |
88 | QString s("This is useful" ); |
89 | |
90 | //test rollback on going out of scope |
91 | { |
92 | QScopedValueRollback<int> ri(i); |
93 | QScopedValueRollback<bool> rb(b); |
94 | QScopedValueRollback<QString> rs(s); |
95 | QCOMPARE(b, false); |
96 | QCOMPARE(i, 0); |
97 | QCOMPARE(s, QString("This is useful" )); |
98 | b = true; |
99 | i = 1; |
100 | s = "Useless" ; |
101 | QCOMPARE(b, true); |
102 | QCOMPARE(i, 1); |
103 | QCOMPARE(s, QString("Useless" )); |
104 | ri.commit(); |
105 | rb.commit(); |
106 | rs.commit(); |
107 | } |
108 | QCOMPARE(b, true); |
109 | QCOMPARE(i, 1); |
110 | QCOMPARE(s, QString("Useless" )); |
111 | } |
112 | |
113 | void tst_QScopedValueRollback::rollbackToPreviousCommit() |
114 | { |
115 | int i=0; |
116 | { |
117 | QScopedValueRollback<int> ri(i); |
118 | i++; |
119 | ri.commit(); |
120 | i++; |
121 | } |
122 | QCOMPARE(i,1); |
123 | { |
124 | QScopedValueRollback<int> ri1(i); |
125 | i++; |
126 | ri1.commit(); |
127 | i++; |
128 | ri1.commit(); |
129 | i++; |
130 | } |
131 | QCOMPARE(i,3); |
132 | } |
133 | |
134 | void tst_QScopedValueRollback::exceptions() |
135 | { |
136 | bool b = false; |
137 | bool caught = false; |
138 | QT_TRY |
139 | { |
140 | QScopedValueRollback<bool> rb(b); |
141 | b = true; |
142 | QT_THROW(std::bad_alloc()); //if Qt compiled without exceptions this is noop |
143 | rb.commit(); //if Qt compiled without exceptions, true is committed |
144 | } |
145 | QT_CATCH(...) |
146 | { |
147 | caught = true; |
148 | } |
149 | QCOMPARE(b, !caught); //expect false if exception was thrown, true otherwise |
150 | } |
151 | |
152 | void tst_QScopedValueRollback::earlyExitScope() |
153 | { |
154 | int i=0; |
155 | int j=0; |
156 | while (true) { |
157 | QScopedValueRollback<int> ri(i); |
158 | i++; |
159 | j=i; |
160 | if (i>8) break; |
161 | ri.commit(); |
162 | } |
163 | QCOMPARE(i,8); |
164 | QCOMPARE(j,9); |
165 | |
166 | for (i = 0; i < 5; i++) { |
167 | j=1; |
168 | earlyExitScope_helper(exitpoint: i,member&: j); |
169 | QCOMPARE(j, 1<<i); |
170 | } |
171 | } |
172 | |
173 | void tst_QScopedValueRollback::earlyExitScope_helper(int exitpoint, int& member) |
174 | { |
175 | QScopedValueRollback<int> r(member); |
176 | member *= 2; |
177 | if (exitpoint == 0) |
178 | return; |
179 | r.commit(); |
180 | member *= 2; |
181 | if (exitpoint == 1) |
182 | return; |
183 | r.commit(); |
184 | member *= 2; |
185 | if (exitpoint == 2) |
186 | return; |
187 | r.commit(); |
188 | member *= 2; |
189 | if (exitpoint == 3) |
190 | return; |
191 | r.commit(); |
192 | } |
193 | |
194 | void tst_QScopedValueRollback::moveOnly() |
195 | { |
196 | std::unique_ptr<int> uniquePtr; |
197 | std::unique_ptr<int> newVal(new int(5)); |
198 | QVERIFY(!uniquePtr); |
199 | { |
200 | QScopedValueRollback<std::unique_ptr<int>> r(uniquePtr, std::move(newVal)); |
201 | QVERIFY(uniquePtr); |
202 | } |
203 | QVERIFY(!uniquePtr); |
204 | } |
205 | |
206 | QTEST_MAIN(tst_QScopedValueRollback) |
207 | #include "tst_qscopedvaluerollback.moc" |
208 | |