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

   1 // Copyright (C) 2019-2021 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-do run { target c++17 } }
  19 // { dg-require-string-conversions "" }
  20
  21 #include <charconv>
  22 #include <string_view>
  23 #include <testsuite_hooks.h>
  24
  25 template<typename C>
  26 bool
  27 check_to_chars(C val)
  28 {
  29   using std::string_view;
  30
  31   char buf1[32], buf2[32], buf3[32];
  32   std::to_chars_result r1 = std::to_chars(buf1, buf1+sizeof(buf1), val);
  33   if (r1.ec != std::errc{})
  34     return false;
  35   std::to_chars_result r2 = std::to_chars(buf2, buf2+sizeof(buf2), val, 10);
  36   if (r2.ec != std::errc{})
  37     return false;
  38   if (string_view(buf1, r1.ptr - buf1) != string_view(buf2, r2.ptr - buf2))
  39     return false;
  40   std::to_chars_result r3 = std::to_chars(buf3, buf3+sizeof(buf3), (long)val);
  41   if (string_view(buf1, r1.ptr - buf1) != string_view(buf3, r3.ptr - buf3))
  42     return false;
  43   return true;
  44 }
  45
  46 void
  47 test01()
  48 {
  49   VERIFY( check_to_chars(u'\x21') );
  50   VERIFY( check_to_chars(U'\x21') );
  51   VERIFY( check_to_chars(L'\x21') );
  52 }
  53
  54 int main()
  55 {
  56   test01();
  57 }