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3  Many large projects use their own data structures instead of the ones in the
4  standard library.  If these data structures are similar in functionality
5  to the standard library, they can be instrumented with the same hooks
6  that are used to instrument the standard library.
7  The instrumentation API is exposed in file
8  <code class="code">profiler.h</code> (look for "Instrumentation hooks").
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