libcxx/test/std/strings/string.view/string.view.ops/compare.pointer.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 int compare(const charT* s) const;
  14
  15 #include <string_view>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "constexpr_char_traits.h"
  20
  21 int sign(int x) { return x > 0 ? 1 : (x < 0 ? -1 : 0); }
  22
  23 template <typename CharT>
  24 void test1(std::basic_string_view<CharT> sv1, const CharT* s, int expected) {
  25   assert(sign(sv1.compare(s)) == sign(expected));
  26 }
  27
  28 template <typename CharT>
  29 void test(const CharT* s1, const CharT* s2, int expected) {
  30   typedef std::basic_string_view<CharT> string_view_t;
  31   string_view_t sv1(s1);
  32   test1(sv1, s2, expected);
  33 }
  34
  35 int main(int, char**) {
  36   {
  37     test("", "", 0);
  38     test("", "abcde", -5);
  39     test("", "abcdefghij", -10);
  40     test("", "abcdefghijklmnopqrst", -20);
  41     test("abcde", "", 5);
  42     test("abcde", "abcde", 0);
  43     test("abcde", "abcdefghij", -5);
  44     test("abcde", "abcdefghijklmnopqrst", -15);
  45     test("abcdefghij", "", 10);
  46     test("abcdefghij", "abcde", 5);
  47     test("abcdefghij", "abcdefghij", 0);
  48     test("abcdefghij", "abcdefghijklmnopqrst", -10);
  49     test("abcdefghijklmnopqrst", "", 20);
  50     test("abcdefghijklmnopqrst", "abcde", 15);
  51     test("abcdefghijklmnopqrst", "abcdefghij", 10);
  52     test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
  53   }
  54
  55 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  56   {
  57     test(L"", L"", 0);
  58     test(L"", L"abcde", -5);
  59     test(L"", L"abcdefghij", -10);
  60     test(L"", L"abcdefghijklmnopqrst", -20);
  61     test(L"abcde", L"", 5);
  62     test(L"abcde", L"abcde", 0);
  63     test(L"abcde", L"abcdefghij", -5);
  64     test(L"abcde", L"abcdefghijklmnopqrst", -15);
  65     test(L"abcdefghij", L"", 10);
  66     test(L"abcdefghij", L"abcde", 5);
  67     test(L"abcdefghij", L"abcdefghij", 0);
  68     test(L"abcdefghij", L"abcdefghijklmnopqrst", -10);
  69     test(L"abcdefghijklmnopqrst", L"", 20);
  70     test(L"abcdefghijklmnopqrst", L"abcde", 15);
  71     test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
  72     test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
  73   }
  74 #endif
  75
  76 #if TEST_STD_VER >= 11
  77   {
  78     test(U"", U"", 0);
  79     test(U"", U"abcde", -5);
  80     test(U"", U"abcdefghij", -10);
  81     test(U"", U"abcdefghijklmnopqrst", -20);
  82     test(U"abcde", U"", 5);
  83     test(U"abcde", U"abcde", 0);
  84     test(U"abcde", U"abcdefghij", -5);
  85     test(U"abcde", U"abcdefghijklmnopqrst", -15);
  86     test(U"abcdefghij", U"", 10);
  87     test(U"abcdefghij", U"abcde", 5);
  88     test(U"abcdefghij", U"abcdefghij", 0);
  89     test(U"abcdefghij", U"abcdefghijklmnopqrst", -10);
  90     test(U"abcdefghijklmnopqrst", U"", 20);
  91     test(U"abcdefghijklmnopqrst", U"abcde", 15);
  92     test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
  93     test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
  94   }
  95
  96   {
  97     test(u"", u"", 0);
  98     test(u"", u"abcde", -5);
  99     test(u"", u"abcdefghij", -10);
 100     test(u"", u"abcdefghijklmnopqrst", -20);
 101     test(u"abcde", u"", 5);
 102     test(u"abcde", u"abcde", 0);
 103     test(u"abcde", u"abcdefghij", -5);
 104     test(u"abcde", u"abcdefghijklmnopqrst", -15);
 105     test(u"abcdefghij", u"", 10);
 106     test(u"abcdefghij", u"abcde", 5);
 107     test(u"abcdefghij", u"abcdefghij", 0);
 108     test(u"abcdefghij", u"abcdefghijklmnopqrst", -10);
 109     test(u"abcdefghijklmnopqrst", u"", 20);
 110     test(u"abcdefghijklmnopqrst", u"abcde", 15);
 111     test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
 112     test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
 113   }
 114 #endif
 115
 116 #if TEST_STD_VER > 11
 117   {
 118     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
 119     constexpr SV sv1;
 120     constexpr SV sv2{"abcde", 5};
 121     static_assert(sv1.compare("") == 0, "");
 122     static_assert(sv1.compare("abcde") < 0, "");
 123     static_assert(sv2.compare("") > 0, "");
 124     static_assert(sv2.compare("abcde") == 0, "");
 125   }
 126 #endif
 127
 128   return 0;
 129 }