libcxx/test/std/strings/basic.string/string.capacity/resize_size_char.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 // void resize(size_type n, charT c); // constexpr since C++20
  12
  13 #include <string>
  14 #include <stdexcept>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18 #include "min_allocator.h"
  19
  20 template <class S>
  21 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, typename S::value_type c, S expected) {
  22   if (n <= s.max_size()) {
  23     s.resize(n, c);
  24     LIBCPP_ASSERT(s.__invariants());
  25     assert(s == expected);
  26   }
  27 #ifndef TEST_HAS_NO_EXCEPTIONS
  28   else if (!TEST_IS_CONSTANT_EVALUATED) {
  29     try {
  30       s.resize(n, c);
  31       assert(false);
  32     } catch (std::length_error&) {
  33       assert(n > s.max_size());
  34     }
  35   }
  36 #endif
  37 }
  38
  39 template <class S>
  40 TEST_CONSTEXPR_CXX20 void test_string() {
  41   test(S(), 0, 'a', S());
  42   test(S(), 1, 'a', S("a"));
  43   test(S(), 10, 'a', S(10, 'a'));
  44   test(S(), 100, 'a', S(100, 'a'));
  45   test(S("12345"), 0, 'a', S());
  46   test(S("12345"), 2, 'a', S("12"));
  47   test(S("12345"), 5, 'a', S("12345"));
  48   test(S("12345"), 15, 'a', S("12345aaaaaaaaaa"));
  49   test(S("12345678901234567890123456789012345678901234567890"), 0, 'a', S());
  50   test(S("12345678901234567890123456789012345678901234567890"), 10, 'a', S("1234567890"));
  51   test(S("12345678901234567890123456789012345678901234567890"),
  52        50,
  53        'a',
  54        S("12345678901234567890123456789012345678901234567890"));
  55   test(S("12345678901234567890123456789012345678901234567890"),
  56        60,
  57        'a',
  58        S("12345678901234567890123456789012345678901234567890aaaaaaaaaa"));
  59   test(S(), S::npos, 'a', S("not going to happen"));
  60 }
  61
  62 TEST_CONSTEXPR_CXX20 bool test() {
  63   test_string<std::string>();
  64 #if TEST_STD_VER >= 11
  65   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  66 #endif
  67
  68   return true;
  69 }
  70
  71 int main(int, char**) {
  72   test();
  73 #if TEST_STD_VER > 17
  74   static_assert(test());
  75 #endif
  76
  77   return 0;
  78 }