libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.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 // <locale>
  10
  11 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
  12
  13 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
  14
  15 // wide_string from_bytes(char byte);
  16 // wide_string from_bytes(const char* ptr);
  17 // wide_string from_bytes(const byte_string& str);
  18 // wide_string from_bytes(const char* first, const char* last);
  19
  20 // XFAIL: no-wide-characters
  21
  22 #include <locale>
  23 #include <codecvt>
  24 #include <cassert>
  25
  26 #include "test_macros.h"
  27
  28 template <class CharT, std::size_t = sizeof(CharT)>
  29 struct TestHelper;
  30 template <class CharT>
  31 struct TestHelper<CharT, 2> {
  32   static void test();
  33 };
  34 template <class CharT>
  35 struct TestHelper<CharT, 4> {
  36   static void test();
  37 };
  38
  39 template <class CharT>
  40 void TestHelper<CharT, 2>::test() {
  41   static_assert((std::is_same<CharT, wchar_t>::value), "");
  42   {
  43     std::wstring_convert<std::codecvt_utf8<CharT> > myconv;
  44     std::string bs("\xE1\x80\x85");
  45     std::wstring ws = myconv.from_bytes('a');
  46     assert(ws == L"a");
  47     ws = myconv.from_bytes(bs.c_str());
  48     assert(ws == L"\u1005");
  49     ws = myconv.from_bytes(bs);
  50     assert(ws == L"\u1005");
  51     ws = myconv.from_bytes(bs.data(), bs.data() + bs.size());
  52     assert(ws == L"\u1005");
  53     ws = myconv.from_bytes("");
  54     assert(ws.size() == 0);
  55   }
  56 }
  57
  58 template <class CharT>
  59 void TestHelper<CharT, 4>::test() {
  60   static_assert((std::is_same<CharT, wchar_t>::value), "");
  61   {
  62     std::wstring_convert<std::codecvt_utf8<CharT> > myconv;
  63     std::string bs("\xF1\x80\x80\x83");
  64     std::wstring ws = myconv.from_bytes('a');
  65     assert(ws == L"a");
  66     ws = myconv.from_bytes(bs.c_str());
  67     assert(ws == L"\U00040003");
  68     ws = myconv.from_bytes(bs);
  69     assert(ws == L"\U00040003");
  70     ws = myconv.from_bytes(bs.data(), bs.data() + bs.size());
  71     assert(ws == L"\U00040003");
  72     ws = myconv.from_bytes("");
  73     assert(ws.size() == 0);
  74   }
  75 }
  76
  77 int main(int, char**) {
  78   TestHelper<wchar_t>::test();
  79   return 0;
  80 }