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16    <h1>Priority-Queue Regression Tests</h1>
17
18    <h2><a name="assoc_desc" id="assoc_desc">Description</a></h2>
19
20    <p>The library contains a single comprehensive regression test.
21    For a given container type in <tt>pb_ds</tt>, the test creates
22    an object of the container type and an object of the
23    corresponding STL type (<i>i.e.</i>,
24    <tt>std::priority_queue</tt>). It then performs a random
25    sequence of methods with random arguments (<i>e.g.</i>, pushes,
26    pops, and so forth) on both objects. At each operation, the
27    test checks the return value of the method, and optionally both
28    compares <tt>pb_ds</tt>'s object with the STL's object as well
29    as performing other consistency checks on <tt>pb_ds</tt>'s
30    object (<i>e.g.</i>, that the size returned by the
31    <tt>size</tt> method corresponds to the distance between its
32    <tt>begin</tt> and end iterators).</p>
33
34    <p>Additionally, the test integrally checks exception safety
35    and resource leaks. This is done as follows. A special
36    allocator type, written for the purpose of the test, both
37    randomly throws an exceptions when allocations are performed,
38    and tracks allocations and de-allocations. The exceptions thrown
39    at allocations simulate memory-allocation failures; the
40    tracking mechanism checks for memory-related bugs (<i>e.g.</i>,
41    resource leaks and multiple de-allocations). Both
42    <tt>pb_ds</tt>'s containers and the containers' value-types are
43    configured to use this allocator.</p>
44
45    <h2><a name="pq_tests" id="pq_tests">Tests</a></h2>
46
47    <p><a href=
48    "http://gcc.gnu.org/viewcvs/*checkout*/trunk/libstdc%2B%2B-v3/testsuite/ext/pb_ds/regression/priority_queue_rand.cc"><tt>priority_queue_rand.cc</tt></a>
49    checks all priority queue types.</p>
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