Re: [Boost-bugs] [Boost C++ Libraries] #4146: [patch] ./boost/property_tree/detail/xml_parser_read_rapidxml.hpp:117: error: non-constant `(((int)f_c) | 3072)' cannot be used as template argument

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4146: [patch] ./boost/property_tree/detail/xml_parser_read_rapidxml.hpp:117: error: non-constant `(((int)f_c) | 3072)' cannot be used as template argument
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-03-21 19:53:16

#4146: [patch] ./boost/property_tree/detail/xml_parser_read_rapidxml.hpp:117:
error: non-constant `(((int)f_c) | 3072)' cannot be used as template
argument
---------------------------------------------------+------------------------
  Reporter:  Jan-Hein Bührman <buhrman@…>          |       Owner:  cornedbee                                              
      Type:  Bugs                                  |      Status:  closed                                                 
 Milestone:                                        |   Component:  property_tree                                          
   Version:  Boost Development Trunk               |    Severity:  Showstopper                                            
Resolution:  fixed                                 |    Keywords:  property_tree xml_parser non-constant template argument
---------------------------------------------------+------------------------

Comment (by buhrman@…):

 Replying to [comment:8 Leonid Gershanovich <gleonid@…>]:
 > I am using boost '''1.46.1'''.
 >
 > Those gcc versions are chocking on "const int" used as template
 argument, since "const int" is not a compile time constant in a strict
 sense.
 Stroustrup, ''The C++ Programming Language'', 3rd ed., 3rd printing, sect.
 13.2.3, ''Template Parameters'', states:
   A template argument can be a constant expression (sect. C.5).
 And sect. C.5, ''Constant Expressions'', states:
   A constant expression evaluates to an integral or enumeration constant.
 Such an
   expression is composed of literals [...], enumerators [...], and
 ''const''s initialized
   by constant expressions.
 I didn't check the official standard, but I guess, reading the above, any
 decent compiler should grok this.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4146#comment:9>
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