libcxx/test/std/strings/basic.string/string.cons/string_view_assignment.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 // basic_string<charT,traits,Allocator>& operator=(basic_string_view<charT, traits> sv); // constexpr since C++20
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "min_allocator.h"
  18 #include "asan_testing.h"
  19
  20 template <class S, class SV>
  21 TEST_CONSTEXPR_CXX20 void test(S s1, SV sv) {
  22   typedef typename S::traits_type T;
  23   s1 = sv;
  24   LIBCPP_ASSERT(s1.__invariants());
  25   assert(s1.size() == sv.size());
  26   assert(T::compare(s1.data(), sv.data(), s1.size()) == 0);
  27   assert(s1.capacity() >= s1.size());
  28   LIBCPP_ASSERT(is_string_asan_correct(s1));
  29 }
  30
  31 template <class S>
  32 TEST_CONSTEXPR_CXX20 void test_string() {
  33   typedef std::string_view SV;
  34   test(S(), SV(""));
  35   test(S("1"), SV(""));
  36   test(S(), SV("1"));
  37   test(S("1"), SV("2"));
  38   test(S("1"), SV("2"));
  39
  40   test(S(), SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  41   test(S("123456789"), SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  42   test(S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"), SV("123456789"));
  43   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
  44        SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  45   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
  46          "1234567890123456789012345678901234567890123456789012345678901234567890"),
  47        SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  48 }
  49
  50 TEST_CONSTEXPR_CXX20 bool test() {
  51   test_string<std::string>();
  52 #if TEST_STD_VER >= 11
  53   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  54   test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
  55 #endif
  56
  57   return true;
  58 }
  59
  60 int main(int, char**) {
  61   test();
  62 #if TEST_STD_VER > 17
  63   static_assert(test());
  64 #endif
  65
  66   return 0;
  67 }