base_ostream template arguments

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From	ruben safir <ruben@mrbrklyn.com>
Newsgroups	comp.lang.c++
Subject	base_ostream template arguments
Date	Mon, 13 Jun 2011 04:40:57 +0000 (UTC)
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The base_ostream template is defined as follows (according to Struostrup)


template<class Ch, class Tr = char_traits<Ch> >
class std::basic_ostream : virtual public basic_ios<Ch, Tr > {
public:
	virtual ~basic_ostream();
//...
};


since Tr is always defined as a function of Ch, why was it necessary for 
two template parameters?

Ruben

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Thread

base_ostream template arguments ruben safir <ruben@mrbrklyn.com> - 2011-06-13 04:40 +0000
  Re: base_ostream template arguments Öö Tiib <ootiib@hot.ee> - 2011-06-12 22:18 -0700
    Re: base_ostream template arguments ruben safir <ruben@mrbrklyn.com> - 2011-06-13 06:08 +0000
    Re: base_ostream template arguments ruben safir <ruben@mrbrklyn.com> - 2011-06-13 06:38 +0000
      Re: base_ostream template arguments Öö Tiib <ootiib@hot.ee> - 2011-06-13 01:45 -0700
  Re: base_ostream template arguments Saeed Amrollahi <amrollahi.saeed@gmail.com> - 2011-06-12 23:14 -0700
    Re: base_ostream template arguments ruben safir <ruben@mrbrklyn.com> - 2011-06-13 06:32 +0000
      Re: base_ostream template arguments Saeed Amrollahi <amrollahi.saeed@gmail.com> - 2011-06-13 00:08 -0700
        Re: base_ostream template arguments ruben safir <ruben@mrbrklyn.com> - 2011-06-13 03:17 -0400
        Re: base_ostream template arguments mrbrklyn <ceo.brooklyn@gmail.com> - 2011-06-13 12:45 -0700

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