libcxx/test/std/strings/basic.string/string.iterators/iterators.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: c++03, c++11
  10
  11 // <string>
  12
  13 // iterator       begin(); // constexpr since C++20
  14 // iterator       end(); // constexpr since C++20
  15 // const_iterator begin()  const; // constexpr since C++20
  16 // const_iterator end()    const; // constexpr since C++20
  17 // const_iterator cbegin() const; // constexpr since C++20
  18 // const_iterator cend()   const; // constexpr since C++20
  19
  20 #include <string>
  21 #include <cassert>
  22
  23 #include "test_macros.h"
  24
  25 template <class C>
  26 TEST_CONSTEXPR_CXX20 void test() {
  27   { // N3644 testing
  28     typename C::iterator ii1{}, ii2{};
  29     typename C::iterator ii4 = ii1;
  30     typename C::const_iterator cii{};
  31
  32     assert(ii1 == ii2);
  33     assert(ii1 == ii4);
  34
  35     assert(!(ii1 != ii2));
  36
  37     assert((ii1 == cii));
  38     assert((cii == ii1));
  39     assert(!(ii1 != cii));
  40     assert(!(cii != ii1));
  41     assert(!(ii1 < cii));
  42     assert(!(cii < ii1));
  43     assert((ii1 <= cii));
  44     assert((cii <= ii1));
  45     assert(!(ii1 > cii));
  46     assert(!(cii > ii1));
  47     assert((ii1 >= cii));
  48     assert((cii >= ii1));
  49     assert(cii - ii1 == 0);
  50     assert(ii1 - cii == 0);
  51   }
  52   {
  53     C a;
  54     typename C::iterator i1 = a.begin();
  55     typename C::iterator i2;
  56     i2 = i1;
  57     assert(i1 == i2);
  58   }
  59 }
  60
  61 TEST_CONSTEXPR_CXX20 bool test() {
  62   test<std::string>();
  63 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  64   test<std::wstring>();
  65 #endif
  66
  67 #ifndef TEST_HAS_NO_CHAR8_T
  68   test<std::u8string>();
  69 #endif
  70
  71   test<std::u16string>();
  72   test<std::u32string>();
  73
  74   return true;
  75 }
  76
  77 int main(int, char**) {
  78   test();
  79 #if TEST_STD_VER > 17
  80   static_assert(test());
  81 #endif
  82   return 0;
  83 }