do_length hides overloaded

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#36 opened on Oct 25, 2017 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: cpp
Domain: cli

Research direction

Start with boost/detail/utf8_codecvt_facet.hpp, especially the do_length declaration around line 181, and inspect the related include path from libs/program_options/src/convert.cpp. Reproduce the compiler warning in the reported build configuration, then verify that the warning is eliminated without changing the codecvt behavior.

Written by the indexing model from the issue text.

Description

Got this in a build today (develop):

https://api.travis-ci.org/jobs/292877168/log.txt?deansi=true

In file included from libs/program_options/src/convert.cpp:19:
In file included from ./boost/program_options/detail/utf8_codecvt_facet.hpp:19:
./boost/detail/utf8_codecvt_facet.hpp:181:17: warning: 'boost::program_options::detail::utf8_codecvt_facet::do_length' hides overloaded virtual function [-Woverloaded-virtual]
    virtual int do_length(
                ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/codecvt.h:453:11: note: hidden overloaded virtual function 'std::codecvt<wchar_t, char, __mbstate_t>::do_length' declared here: type mismatch at 1st parameter ('std::codecvt<wchar_t, char, __mbstate_t>::state_type &' (aka '__mbstate_t &') vs 'const std::mbstate_t &' (aka 'const __mbstate_t &'))
      int do_length(state_type&, const extern_type* __from,
          ^

Dominant language: C++
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