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If the use of the ruby namespace isn't prepended by `::` to make it explicit that the global ruby namespace is referenced here, it can clash with other non-global namespace named ruby, e.g. ``` // declaration namespace myproject { namespace ruby { // my ruby classes } } // implementation using namespace myproject; [...] rb_define_method(...); [...] ``` leads to the following error: ``` ../ruby/choice.cc: In function 'void {anonymous}::do_register_choice()': ../ruby/choice.cc:342:9: error: reference to 'ruby' is ambiguous 342 | rb_define_method(c_choices, "each", RUBY_FUNC_CAST(&choices_each), 0); | ^~~~~~~~~~~~~~~~ In file included from ../ruby/choice.cc:20: ../ruby/paludis_ruby.hh:53:15: note: candidates are: 'namespace paludis::ruby { }' 53 | namespace ruby | ^~~~ In file included from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/backward/2/stdalign.h:23, from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/defines.h:77, from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/ruby.h:23, from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby.h:38, from ../ruby/paludis_ruby.hh:44, from ../ruby/choice.cc:20: /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/internal/stdalign.h:92:11: note: 'namespace ruby { }' 92 | namespace ruby { | ^~~~ In file included from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/internal/anyargs.h:83, from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/ruby.h:24, from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby.h:38, from ../ruby/paludis_ruby.hh:44, from ../ruby/choice.cc:20: ../ruby/choice.cc:342:9: error: '::define' has not been declared 342 | rb_define_method(c_choices, "each", RUBY_FUNC_CAST(&choices_each), 0); | ^~~~~~~~~~~~~~~~ ../ruby/choice.cc:344:9: error: reference to 'ruby' is ambiguous 344 | rb_define_method(c_choices, "find_by_name_with_prefix", RUBY_FUNC_CAST(&choices_find_by_name_with_prefix), 1); | ^~~~~~~~~~~~~~~~ ``` |
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cxxanyargs.hpp |