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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/22_locale/codecvt/length/wchar_t/6.cc
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1 // 2003-02-06 Petur Runolfsson <peturr02@ru.is>
3 // Copyright (C) 2003-2024 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
20 // 22.2.1.5 - Template class codecvt [lib.locale.codecvt]
24 #include <testsuite_hooks.h>
26 // Need to explicitly set the state(mbstate_t) to zero.
27 // How to do this is not specified by the ISO C99 standard, so we
28 // might need to add some operators to make the intuiative case
30 // w_codecvt::state_type state00;
32 // or, can use this explicit "C" initialization:
33 // w_codecvt::state_type state01 = {0, 0};
34 // .. except Ulrich says: Use memset. Always use memset. Feel the force...
36 zero_state(std::mbstate_t& state
)
37 { std::memset(&state
, 0, sizeof(std::mbstate_t)); }
39 bool length_called
= false;
41 class length_codecvt
: public std::codecvt
<wchar_t, char, std::mbstate_t>
43 typedef std::codecvt
<wchar_t, char, std::mbstate_t> w_codecvt
;
46 // DR75: type of first argument of do_length is state_type&
47 virtual int do_length(state_type
& state
, const extern_type
* from
,
48 const extern_type
* end
, std::size_t max
) const
51 return w_codecvt::do_length(state
, from
, end
, max
);
55 // Required instantiation
56 // codecvt<wchar_t, char, mbstate_t>
62 typedef codecvt
<wchar_t, char, mbstate_t> w_codecvt
;
63 typedef char ext_type
;
65 const ext_type
* e_lit
= "black pearl jasmine tea";
66 int size
= strlen(e_lit
);
69 loc
= locale(loc
, new length_codecvt
);
70 const w_codecvt
* cvt
= &use_facet
<w_codecvt
>(loc
);
72 w_codecvt::state_type state04
;
74 length_called
= false;
75 cvt
->length(state04
, e_lit
, e_lit
+ size
, 5);
76 VERIFY( length_called
);