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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <streambuf>
     11 
     12 // template <class charT, class traits = char_traits<charT> >
     13 // class basic_streambuf;
     14 
     15 // void swap(basic_streambuf& rhs);
     16 
     17 #include <streambuf>
     18 #include <cassert>
     19 
     20 #include "platform_support.h" // locale name macros
     21 
     22 template <class CharT>
     23 struct test
     24     : public std::basic_streambuf<CharT>
     25 {
     26     typedef std::basic_streambuf<CharT> base;
     27     test() {}
     28 
     29     void swap(test& t)
     30     {
     31         test old_this(*this);
     32         test old_that(t);
     33         base::swap(t);
     34         assert(this->eback() == old_that.eback());
     35         assert(this->gptr()  == old_that.gptr());
     36         assert(this->egptr() == old_that.egptr());
     37         assert(this->pbase() == old_that.pbase());
     38         assert(this->pptr()  == old_that.pptr());
     39         assert(this->epptr() == old_that.epptr());
     40         assert(this->getloc() == old_that.getloc());
     41 
     42         assert(t.eback() == old_this.eback());
     43         assert(t.gptr()  == old_this.gptr());
     44         assert(t.egptr() == old_this.egptr());
     45         assert(t.pbase() == old_this.pbase());
     46         assert(t.pptr()  == old_this.pptr());
     47         assert(t.epptr() == old_this.epptr());
     48         assert(t.getloc() == old_this.getloc());
     49         return *this;
     50     }
     51 
     52     void setg(CharT* gbeg, CharT* gnext, CharT* gend)
     53     {
     54         base::setg(gbeg, gnext, gend);
     55     }
     56     void setp(CharT* pbeg, CharT* pend)
     57     {
     58         base::setp(pbeg, pend);
     59     }
     60 };
     61 
     62 int main()
     63 {
     64     {
     65         test<char> t;
     66         test<char> t2;
     67         swap(t2, t);
     68     }
     69     {
     70         test<wchar_t> t;
     71         test<wchar_t> t2;
     72         swap(t2, t);
     73     }
     74     {
     75         char g1, g2, g3, p1, p3;
     76         test<char> t;
     77         t.setg(&g1, &g2, &g3);
     78         t.setp(&p1, &p3);
     79         test<char> t2;
     80         swap(t2, t);
     81     }
     82     {
     83         wchar_t g1, g2, g3, p1, p3;
     84         test<wchar_t> t;
     85         t.setg(&g1, &g2, &g3);
     86         t.setp(&p1, &p3);
     87         test<wchar_t> t2;
     88         swap(t2, t);
     89     }
     90     std::locale::global(std::locale(LOCALE_en_US_UTF_8));
     91     {
     92         test<char> t;
     93         test<char> t2;
     94         swap(t2, t);
     95     }
     96     {
     97         test<wchar_t> t;
     98         test<wchar_t> t2;
     99         swap(t2, t);
    100     }
    101 }
    102