libcxx/test/std/strings/string.view/string.view.comparison/ople.string_view.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 // <string>
  10
  11 // template<class charT, class traits, class Allocator>
  12 //   constexpr bool operator<=(const charT* lhs, basic_string_view<charT,traits> rhs);
  13 // template<class charT, class traits, class Allocator>
  14 //   constexpr bool operator<=(basic_string_view<charT,traits> lhs, const charT* rhs);
  15
  16 #include <string_view>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20 #include "constexpr_char_traits.h"
  21
  22 template <class S>
  23 void
  24 test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
  25 {
  26     assert((lhs <= rhs) == x);
  27     assert((rhs <= lhs) == y);
  28 }
  29
  30 int main(int, char**)
  31 {
  32     {
  33     typedef std::string_view S;
  34     test("", S(""), true, true);
  35     test("", S("abcde"), true, false);
  36     test("", S("abcdefghij"), true, false);
  37     test("", S("abcdefghijklmnopqrst"), true, false);
  38     test("abcde", S(""), false, true);
  39     test("abcde", S("abcde"), true, true);
  40     test("abcde", S("abcdefghij"), true, false);
  41     test("abcde", S("abcdefghijklmnopqrst"), true, false);
  42     test("abcdefghij", S(""), false, true);
  43     test("abcdefghij", S("abcde"), false, true);
  44     test("abcdefghij", S("abcdefghij"), true, true);
  45     test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
  46     test("abcdefghijklmnopqrst", S(""), false, true);
  47     test("abcdefghijklmnopqrst", S("abcde"), false, true);
  48     test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
  49     test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
  50     }
  51
  52 #if TEST_STD_VER > 11
  53     {
  54     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
  55     constexpr SV  sv1;
  56     constexpr SV  sv2 { "abcde", 5 };
  57
  58     static_assert (  sv1     <= "", "" );
  59     static_assert (  ""      <= sv1, "" );
  60     static_assert (  sv1     <= "abcde", "" );
  61     static_assert (!("abcde" <= sv1), "" );
  62
  63     static_assert (!(sv2      <= ""), "" );
  64     static_assert (  ""       <= sv2, "" );
  65     static_assert (  sv2      <= "abcde", "" );
  66     static_assert (  "abcde"  <= sv2, "" );
  67     static_assert (  sv2      <= "abcde0", "" );
  68     static_assert (!("abcde0" <= sv2), "" );
  69     }
  70 #endif
  71
  72   return 0;
  73 }