libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.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 // we get this comparison "for free" because the string implicitly converts to the string_view
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "min_allocator.h"
  18
  19 template <class S, class SV>
  20 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
  21   assert((lhs > rhs) == x);
  22 }
  23
  24 template <class CharT, template <class> class Alloc>
  25 TEST_CONSTEXPR_CXX20 void test_string() {
  26   using S  = std::basic_string<CharT, std::char_traits<CharT>, Alloc<CharT> >;
  27   using SV = std::basic_string_view<CharT, std::char_traits<CharT> >;
  28   test(SV(""), S(""), false);
  29   test(SV(""), S("abcde"), false);
  30   test(SV(""), S("abcdefghij"), false);
  31   test(SV(""), S("abcdefghijklmnopqrst"), false);
  32   test(SV("abcde"), S(""), true);
  33   test(SV("abcde"), S("abcde"), false);
  34   test(SV("abcde"), S("abcdefghij"), false);
  35   test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
  36   test(SV("abcdefghij"), S(""), true);
  37   test(SV("abcdefghij"), S("abcde"), true);
  38   test(SV("abcdefghij"), S("abcdefghij"), false);
  39   test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
  40   test(SV("abcdefghijklmnopqrst"), S(""), true);
  41   test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
  42   test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
  43   test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
  44 }
  45
  46 TEST_CONSTEXPR_CXX20 bool test() {
  47   test_string<char, std::allocator>();
  48 #if TEST_STD_VER >= 11
  49   test_string<char, min_allocator>();
  50 #endif
  51
  52   return true;
  53 }
  54
  55 int main(int, char**) {
  56   test();
  57 #if TEST_STD_VER > 17
  58   static_assert(test());
  59 #endif
  60
  61   return 0;
  62 }