libcxx/test/std/strings/basic.string/string.modifiers/string_copy/copy.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 // size_type copy(charT* s, size_type n, size_type pos = 0) const; // constexpr since C++20
  12
  13 #include <string>
  14 #include <stdexcept>
  15 #include <algorithm>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 template <class S>
  22 TEST_CONSTEXPR_CXX20 void test(S str, typename S::value_type* s, typename S::size_type n, typename S::size_type pos) {
  23   const S& cs = str;
  24   if (pos <= cs.size()) {
  25     typename S::size_type r    = cs.copy(s, n, pos);
  26     typename S::size_type rlen = std::min(n, cs.size() - pos);
  27     assert(r == rlen);
  28     for (r = 0; r < rlen; ++r)
  29       assert(S::traits_type::eq(cs[pos + r], s[r]));
  30   }
  31 #ifndef TEST_HAS_NO_EXCEPTIONS
  32   else if (!TEST_IS_CONSTANT_EVALUATED) {
  33     try {
  34       typename S::size_type r = cs.copy(s, n, pos);
  35       ((void)r); // Prevent unused warning
  36       assert(false);
  37     } catch (std::out_of_range&) {
  38       assert(pos > str.size());
  39     }
  40   }
  41 #endif
  42 }
  43
  44 template <class S>
  45 TEST_CONSTEXPR_CXX20 void test_string() {
  46   char s[50];
  47   test(S(""), s, 0, 0);
  48   test(S(""), s, 0, 1);
  49   test(S(""), s, 1, 0);
  50   test(S("abcde"), s, 0, 0);
  51   test(S("abcde"), s, 0, 1);
  52   test(S("abcde"), s, 0, 2);
  53   test(S("abcde"), s, 0, 4);
  54   test(S("abcde"), s, 0, 5);
  55   test(S("abcde"), s, 0, 6);
  56   test(S("abcde"), s, 1, 0);
  57   test(S("abcde"), s, 1, 1);
  58   test(S("abcde"), s, 1, 2);
  59   test(S("abcde"), s, 1, 4);
  60   test(S("abcde"), s, 1, 5);
  61   test(S("abcde"), s, 2, 0);
  62   test(S("abcde"), s, 2, 1);
  63   test(S("abcde"), s, 2, 2);
  64   test(S("abcde"), s, 2, 4);
  65   test(S("abcde"), s, 4, 0);
  66   test(S("abcde"), s, 4, 1);
  67   test(S("abcde"), s, 4, 2);
  68   test(S("abcde"), s, 5, 0);
  69   test(S("abcde"), s, 5, 1);
  70   test(S("abcde"), s, 6, 0);
  71   test(S("abcdefghijklmnopqrst"), s, 0, 0);
  72   test(S("abcdefghijklmnopqrst"), s, 0, 1);
  73   test(S("abcdefghijklmnopqrst"), s, 0, 2);
  74   test(S("abcdefghijklmnopqrst"), s, 0, 10);
  75   test(S("abcdefghijklmnopqrst"), s, 0, 19);
  76   test(S("abcdefghijklmnopqrst"), s, 0, 20);
  77   test(S("abcdefghijklmnopqrst"), s, 0, 21);
  78   test(S("abcdefghijklmnopqrst"), s, 1, 0);
  79   test(S("abcdefghijklmnopqrst"), s, 1, 1);
  80   test(S("abcdefghijklmnopqrst"), s, 1, 2);
  81   test(S("abcdefghijklmnopqrst"), s, 1, 9);
  82   test(S("abcdefghijklmnopqrst"), s, 1, 18);
  83   test(S("abcdefghijklmnopqrst"), s, 1, 19);
  84   test(S("abcdefghijklmnopqrst"), s, 1, 20);
  85   test(S("abcdefghijklmnopqrst"), s, 2, 0);
  86   test(S("abcdefghijklmnopqrst"), s, 2, 1);
  87   test(S("abcdefghijklmnopqrst"), s, 2, 2);
  88   test(S("abcdefghijklmnopqrst"), s, 2, 9);
  89   test(S("abcdefghijklmnopqrst"), s, 2, 17);
  90   test(S("abcdefghijklmnopqrst"), s, 2, 18);
  91   test(S("abcdefghijklmnopqrst"), s, 2, 19);
  92   test(S("abcdefghijklmnopqrst"), s, 10, 0);
  93   test(S("abcdefghijklmnopqrst"), s, 10, 1);
  94   test(S("abcdefghijklmnopqrst"), s, 10, 2);
  95   test(S("abcdefghijklmnopqrst"), s, 10, 5);
  96   test(S("abcdefghijklmnopqrst"), s, 10, 9);
  97   test(S("abcdefghijklmnopqrst"), s, 10, 10);
  98   test(S("abcdefghijklmnopqrst"), s, 10, 11);
  99   test(S("abcdefghijklmnopqrst"), s, 19, 0);
 100   test(S("abcdefghijklmnopqrst"), s, 19, 1);
 101   test(S("abcdefghijklmnopqrst"), s, 19, 2);
 102   test(S("abcdefghijklmnopqrst"), s, 20, 0);
 103   test(S("abcdefghijklmnopqrst"), s, 20, 1);
 104   test(S("abcdefghijklmnopqrst"), s, 21, 0);
 105 }
 106
 107 TEST_CONSTEXPR_CXX20 bool test() {
 108   test_string<std::string>();
 109 #if TEST_STD_VER >= 11
 110   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
 111 #endif
 112
 113   return true;
 114 }
 115
 116 int main(int, char**) {
 117   test();
 118 #if TEST_STD_VER > 17
 119   static_assert(test());
 120 #endif
 121
 122   return 0;
 123 }