libcxx/test/std/strings/string.view/string_view.literals/literal.pass.cpp

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // UNSUPPORTED: c++03, c++11
  11
  12 // Note: libc++ supports string_view before C++17, but literals were introduced in C++14
  13
  14 #include <string_view>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
  20     typedef std::u8string_view u8string_view;
  21 #else
  22     typedef std::string_view   u8string_view;
  23 #endif
  24
  25 int main(int, char**)
  26 {
  27     using namespace std::literals::string_view_literals;
  28
  29     static_assert ( std::is_same<decltype(   "Hi"sv), std::string_view>::value, "" );
  30     static_assert ( std::is_same<decltype( u8"Hi"sv), u8string_view>::value, "" );
  31     static_assert ( std::is_same<decltype(  L"Hi"sv), std::wstring_view>::value, "" );
  32     static_assert ( std::is_same<decltype(  u"Hi"sv), std::u16string_view>::value, "" );
  33     static_assert ( std::is_same<decltype(  U"Hi"sv), std::u32string_view>::value, "" );
  34
  35     std::string_view foo;
  36     std::wstring_view Lfoo;
  37     u8string_view u8foo;
  38     std::u16string_view ufoo;
  39     std::u32string_view Ufoo;
  40
  41
  42     foo  =    ""sv;     assert(  foo.size() == 0);
  43     u8foo = u8""sv;     assert(u8foo.size() == 0);
  44     Lfoo  =  L""sv;     assert( Lfoo.size() == 0);
  45     ufoo  =  u""sv;     assert( ufoo.size() == 0);
  46     Ufoo  =  U""sv;     assert( Ufoo.size() == 0);
  47
  48     foo   =   " "sv;    assert(  foo.size() == 1);
  49     u8foo = u8" "sv;    assert(u8foo.size() == 1);
  50     Lfoo  =  L" "sv;    assert( Lfoo.size() == 1);
  51     ufoo  =  u" "sv;    assert( ufoo.size() == 1);
  52     Ufoo  =  U" "sv;    assert( Ufoo.size() == 1);
  53
  54     foo   =   "ABC"sv;  assert(  foo ==   "ABC");   assert(  foo == std::string_view   (  "ABC"));
  55     u8foo = u8"ABC"sv;  assert(u8foo == u8"ABC");   assert(u8foo == u8string_view      (u8"ABC"));
  56     Lfoo  =  L"ABC"sv;  assert( Lfoo ==  L"ABC");   assert( Lfoo == std::wstring_view  ( L"ABC"));
  57     ufoo  =  u"ABC"sv;  assert( ufoo ==  u"ABC");   assert( ufoo == std::u16string_view( u"ABC"));
  58     Ufoo  =  U"ABC"sv;  assert( Ufoo ==  U"ABC");   assert( Ufoo == std::u32string_view( U"ABC"));
  59
  60     static_assert(  "ABC"sv.size() == 3, "");
  61     static_assert(u8"ABC"sv.size() == 3, "");
  62     static_assert( L"ABC"sv.size() == 3, "");
  63     static_assert( u"ABC"sv.size() == 3, "");
  64     static_assert( U"ABC"sv.size() == 3, "");
  65
  66     static_assert(noexcept(  "ABC"sv), "");
  67     static_assert(noexcept(u8"ABC"sv), "");
  68     static_assert(noexcept( L"ABC"sv), "");
  69     static_assert(noexcept( u"ABC"sv), "");
  70     static_assert(noexcept( U"ABC"sv), "");
  71
  72   return 0;
  73 }