BIND 10 #2536: Eliminate „using namespace“ from headers

[BIND 10 Development]

#2536: Eliminate „using namespace“ from headers
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                   Reporter:         |                 Owner:
  vorner                             |                Status:  new
                       Type:         |             Milestone:  New Tasks
  defect                             |              Keywords:
                   Priority:         |             Sensitive:  0
  medium                             |           Sub-Project:  DNS
                  Component:         |  Estimated Difficulty:  0
  Unclassified                       |           Total Hours:  0
               CVSS Scoring:         |
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Today, I noticed several headers contain the „using namespace“ directive.
 While
 we agreed not to use „using namespace“ generally, it is even worse in case
 of
 headers, because it pushes the namespace to all files that include it.
 This
 should be fixed before it causes some hard-to-find problem.

 We may want to keep them in the tests, but the ones in `lib/cache` are
 serious, I believe:
 {{{
 $ find -iname '*.h' | xargs grep -n '^using'
 ./src/lib/nsas/tests/nsas_test.h:41:using namespace isc::dns::rdata;
 ./src/lib/nsas/tests/nsas_test.h:42:using namespace isc::dns;
 ./src/lib/nsas/tests/nsas_test.h:43:using namespace isc::util;
 ./src/lib/nsas/tests/nsas_test.h:44:using
 isc::util::unittests::TestResolver;
 ./src/lib/cache/tests/cache_test_messagefromfile.h:20:using namespace isc;
 ./src/lib/cache/tests/cache_test_messagefromfile.h:21:using namespace
 isc::dns;
 ./src/lib/cache/tests/cache_test_sectioncount.h:20:using namespace isc;
 ./src/lib/cache/tests/cache_test_sectioncount.h:21:using namespace
 isc::dns;
 ./src/lib/cache/rrset_entry.h:25:using namespace isc::nsas;
 ./src/lib/cache/message_entry.h:25:using namespace isc::nsas;
 ./src/lib/cache/rrset_cache.h:23:using namespace isc::nsas;
 ./src/lib/dns/tests/rdata_unittest.h:27:using namespace isc::util;
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/2536>
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