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
  19 template <class S, class SV>
  20 TEST_CONSTEXPR_CXX20 void test(S s1, SV sv) {
  21   typedef typename S::traits_type T;
  22   s1 = sv;
  23   LIBCPP_ASSERT(s1.__invariants());
  24   assert(s1.size() == sv.size());
  25   assert(T::compare(s1.data(), sv.data(), s1.size()) == 0);
  26   assert(s1.capacity() >= s1.size());
  27 }
  28
  29 template <class S>
  30 TEST_CONSTEXPR_CXX20 void test_string() {
  31   typedef std::string_view SV;
  32   test(S(), SV(""));
  33   test(S("1"), SV(""));
  34   test(S(), SV("1"));
  35   test(S("1"), SV("2"));
  36   test(S("1"), SV("2"));
  37
  38   test(S(), SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  39   test(S("123456789"), SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  40   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
  41        SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  42   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
  43          "1234567890123456789012345678901234567890123456789012345678901234567890"),
  44        SV("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
  45 }
  46
  47 TEST_CONSTEXPR_CXX20 bool test() {
  48   test_string<std::string>();
  49 #if TEST_STD_VER >= 11
  50   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  51 #endif
  52
  53   return true;
  54 }
  55
  56 int main(int, char**) {
  57   test();
  58 #if TEST_STD_VER > 17
  59   static_assert(test());
  60 #endif
  61
  62   return 0;
  63 }