libcxx/test/std/strings/string.view/string.view.cons/from_ptr_len.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 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
  10
  11 // <string_view>
  12
  13 //  constexpr basic_string_view(const _CharT* _s, size_type _len)
  14 //      : __data (_s), __size(_len) {}
  15
  16 #include <string_view>
  17 #include <string>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 template <typename CharT>
  23 void test(const CharT* s, std::size_t sz) {
  24   {
  25     typedef std::basic_string_view<CharT> SV;
  26     LIBCPP_ASSERT_NOEXCEPT(SV(s, sz));
  27
  28     SV sv1(s, sz);
  29     assert(sv1.size() == sz);
  30     assert(sv1.data() == s);
  31   }
  32 }
  33
  34 int main(int, char**) {
  35   test("QBCDE", 5);
  36   test("QBCDE", 2);
  37   test("", 0);
  38 #if TEST_STD_VER > 11
  39   {
  40     constexpr const char* s = "QBCDE";
  41     constexpr std::basic_string_view<char> sv1(s, 2);
  42     static_assert(sv1.size() == 2, "");
  43     static_assert(sv1.data() == s, "");
  44   }
  45 #endif
  46
  47 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  48   test(L"QBCDE", 5);
  49   test(L"QBCDE", 2);
  50   test(L"", 0);
  51 #  if TEST_STD_VER > 11
  52   {
  53     constexpr const wchar_t* s = L"QBCDE";
  54     constexpr std::basic_string_view<wchar_t> sv1(s, 2);
  55     static_assert(sv1.size() == 2, "");
  56     static_assert(sv1.data() == s, "");
  57   }
  58 #  endif
  59 #endif // TEST_HAS_NO_WIDE_CHARACTERS
  60
  61 #if TEST_STD_VER >= 11
  62   test(u"QBCDE", 5);
  63   test(u"QBCDE", 2);
  64   test(u"", 0);
  65 #  if TEST_STD_VER > 11
  66   {
  67     constexpr const char16_t* s = u"QBCDE";
  68     constexpr std::basic_string_view<char16_t> sv1(s, 2);
  69     static_assert(sv1.size() == 2, "");
  70     static_assert(sv1.data() == s, "");
  71   }
  72 #  endif
  73
  74   test(U"QBCDE", 5);
  75   test(U"QBCDE", 2);
  76   test(U"", 0);
  77 #  if TEST_STD_VER > 11
  78   {
  79     constexpr const char32_t* s = U"QBCDE";
  80     constexpr std::basic_string_view<char32_t> sv1(s, 2);
  81     static_assert(sv1.size() == 2, "");
  82     static_assert(sv1.data() == s, "");
  83   }
  84 #  endif
  85 #endif
  86
  87   return 0;
  88 }