| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // This test checks that we can explicitly instantiate std::string with a custom |
| // character type and traits and then use `shrink_to_fit`. In particular, this is |
| // a regression test for the bug that was reported at https://stackoverflow.com/q/69520633/627587 |
| // and https://seedcentral.apple.com/sm/feedback_collector/radar/85053279. |
| |
| // RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -DTU1 -c -o %t.tu1.o |
| // RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -DTU2 -c -o %t.tu2.o |
| // RUN: %{cxx} %{flags} %t.tu1.o %t.tu2.o %{link_flags} -o %t.exe |
| |
| // UNSUPPORTED: no-localization |
| |
| #include <cstdint> |
| #include <ios> |
| #include <string> |
| |
| typedef std::uint16_t char16; |
| |
| struct string16_char_traits { |
| typedef char16 char_type; |
| typedef int int_type; |
| |
| typedef std::streamoff off_type; |
| typedef std::mbstate_t state_type; |
| typedef std::fpos<state_type> pos_type; |
| |
| static void assign(char_type&, const char_type&) { } |
| static bool eq(const char_type&, const char_type&) { return false; } |
| static bool lt(const char_type&, const char_type&) { return false; } |
| static int compare(const char_type*, const char_type*, std::size_t) { return 0; } |
| static std::size_t length(const char_type*) { return 0; } |
| static const char_type* find(const char_type*, std::size_t, const char_type&) { return nullptr; } |
| static char_type* move(char_type*, const char_type*, std::size_t) { return nullptr; } |
| static char_type* copy(char_type*, const char_type*, std::size_t) { return nullptr; } |
| static char_type* assign(char_type*, std::size_t, char_type) { return nullptr; } |
| static int_type not_eof(const int_type&) { return 0; } |
| static char_type to_char_type(const int_type&) { return char_type(); } |
| static int_type to_int_type(const char_type&) { return int_type(); } |
| static bool eq_int_type(const int_type&, const int_type&) { return false; } |
| static int_type eof() { return int_type(); } |
| }; |
| |
| #if defined(TU1) |
| template class std::basic_string<char16, string16_char_traits>; |
| #else |
| extern template class std::basic_string<char16, string16_char_traits>; |
| |
| int main(int, char**) { |
| std::basic_string<char16, string16_char_traits> s; |
| s.shrink_to_fit(); |
| } |
| #endif |