libstdc++-v3/testsuite/20_util/to_chars/3.cc

   1 // Copyright (C) 2019-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-std=gnu++17" }
  19 // { dg-do run { target c++17 } }
  20 // { dg-require-string-conversions "" }
  21
  22 #include <charconv>
  23 #include <string_view>
  24 #include <testsuite_hooks.h>
  25
  26 template<typename C>
  27 bool
  28 check_to_chars(C val)
  29 {
  30   using std::string_view;
  31
  32   char buf1[32], buf2[32], buf3[32];
  33   std::to_chars_result r1 = std::to_chars(buf1, buf1+sizeof(buf1), val);
  34   if (r1.ec != std::errc{})
  35     return false;
  36   std::to_chars_result r2 = std::to_chars(buf2, buf2+sizeof(buf2), val, 10);
  37   if (r2.ec != std::errc{})
  38     return false;
  39   if (string_view(buf1, r1.ptr - buf1) != string_view(buf2, r2.ptr - buf2))
  40     return false;
  41   std::to_chars_result r3 = std::to_chars(buf3, buf3+sizeof(buf3), (long)val);
  42   if (string_view(buf1, r1.ptr - buf1) != string_view(buf3, r3.ptr - buf3))
  43     return false;
  44   return true;
  45 }
  46
  47 void
  48 test01()
  49 {
  50   VERIFY( check_to_chars(u'\x21') );
  51   VERIFY( check_to_chars(U'\x21') );
  52 #if _GLIBCXX_USE_WCHAR_T
  53   VERIFY( check_to_chars(L'\x21') );
  54 #endif
  55 }
  56
  57 int main()
  58 {
  59   test01();
  60 }