libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.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_utf16
  16 //     : public codecvt<Elem, char, mbstate_t>
  17 // {
  18 //     // unspecified
  19 // };
  20
  21 // int max_length() const throw();
  22
  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
  31 template <class CharT>
  32 struct TestHelper<CharT, 2> {
  33   static void test();
  34 };
  35
  36 template <class CharT>
  37 struct TestHelper<CharT, 4> {
  38   static void test();
  39 };
  40
  41 template <class CharT>
  42 void TestHelper<CharT, 2>::test() {
  43   {
  44     typedef std::codecvt_utf16<CharT> C;
  45     C c;
  46     int r = c.max_length();
  47     assert(r == 2);
  48   }
  49   {
  50     typedef std::codecvt_utf16<CharT, 0xFFFFFFFF, std::consume_header> C;
  51     C c;
  52     int r = c.max_length();
  53     assert(r == 4);
  54   }
  55 }
  56
  57 template <class CharT>
  58 void TestHelper<CharT, 4>::test() {
  59   {
  60     typedef std::codecvt_utf16<CharT> C;
  61     C c;
  62     int r = c.max_length();
  63     assert(r == 4);
  64   }
  65   {
  66     typedef std::codecvt_utf16<CharT, 0xFFFFFFFF, std::consume_header> C;
  67     C c;
  68     int r = c.max_length();
  69     assert(r == 6);
  70   }
  71 }
  72
  73 int main(int, char**) {
  74 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  75   TestHelper<wchar_t>::test();
  76 #endif
  77   TestHelper<char16_t>::test();
  78   TestHelper<char32_t>::test();
  79   return 0;
  80 }