libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <codecvt>
  10
  11 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
  12
  13 // template <class Elem, unsigned long Maxcode = 0x10ffff,
  14 //           codecvt_mode Mode = (codecvt_mode)0>
  15 // class codecvt_utf8
  16 //     : public codecvt<Elem, char, mbstate_t>
  17 // {
  18 //     // unspecified
  19 // };
  20
  21 // result
  22 //     unshift(stateT& state,
  23 //             externT* to, externT* to_end, externT*& to_next) const;
  24
  25 #include <codecvt>
  26 #include <cassert>
  27
  28 #include "test_macros.h"
  29
  30 int main(int, char**)
  31 {
  32 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  33     {
  34         typedef std::codecvt_utf8<wchar_t> C;
  35         C c;
  36         char n[4] = {0};
  37         std::mbstate_t m;
  38         char* np = nullptr;
  39         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
  40         assert(r == std::codecvt_base::noconv);
  41     }
  42 #endif
  43     {
  44         typedef std::codecvt_utf8<char16_t> C;
  45         C c;
  46         char n[4] = {0};
  47         std::mbstate_t m;
  48         char* np = nullptr;
  49         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
  50         assert(r == std::codecvt_base::noconv);
  51     }
  52     {
  53         typedef std::codecvt_utf8<char32_t> C;
  54         C c;
  55         char n[4] = {0};
  56         std::mbstate_t m;
  57         char* np = nullptr;
  58         std::codecvt_base::result r = c.unshift(m, n, n+4, np);
  59         assert(r == std::codecvt_base::noconv);
  60     }
  61
  62   return 0;
  63 }