libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.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>& assign(const charT* s); // 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, const typename S::value_type* str, S expected) {
  22   s.assign(str);
  23   LIBCPP_ASSERT(s.__invariants());
  24   assert(s == expected);
  25 }
  26
  27 template <class S>
  28 TEST_CONSTEXPR_CXX20 void test_string() {
  29   test(S(), "", S());
  30   test(S(), "12345", S("12345"));
  31   test(S(), "12345678901234567890", S("12345678901234567890"));
  32
  33   test(S("12345"), "", S());
  34   test(S("12345"), "12345", S("12345"));
  35   test(S("12345"), "1234567890", S("1234567890"));
  36
  37   test(S("12345678901234567890"), "", S());
  38   test(S("12345678901234567890"), "12345", S("12345"));
  39   test(S("12345678901234567890"), "12345678901234567890", S("12345678901234567890"));
  40 }
  41
  42 TEST_CONSTEXPR_CXX20 bool test() {
  43   test_string<std::string>();
  44 #if TEST_STD_VER >= 11
  45   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  46 #endif
  47
  48   { // test assignment to self
  49     typedef std::string S;
  50     S s_short = "123/";
  51     S s_long  = "Lorem ipsum dolor sit amet, consectetur/";
  52
  53     s_short.assign(s_short.c_str());
  54     assert(s_short == "123/");
  55     s_short.assign(s_short.c_str() + 2);
  56     assert(s_short == "3/");
  57
  58     s_long.assign(s_long.c_str() + 30);
  59     assert(s_long == "nsectetur/");
  60   }
  61
  62   return true;
  63 }
  64
  65 int main(int, char**) {
  66   test();
  67 #if TEST_STD_VER > 17
  68   static_assert(test());
  69 #endif
  70
  71   return 0;
  72 }