60 lines · 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-exception6//7//===----------------------------------------------------------------------===//8 9// This test checks that we can explicitly instantiate std::string with a custom10// character type and traits and then use `shrink_to_fit`. In particular, this is11// a regression test for the bug that was reported at https://stackoverflow.com/q/69520633/62758712// and https://seedcentral.apple.com/sm/feedback_collector/radar/85053279.13 14// RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -DTU1 -c -o %t.tu1.o15// RUN: %{cxx} %{flags} %{compile_flags} %s %{link_flags} -DTU2 -c -o %t.tu2.o16// RUN: %{cxx} %{flags} %t.tu1.o %t.tu2.o %{link_flags} -o %t.exe17 18// UNSUPPORTED: no-localization19 20#include <cstdint>21#include <ios>22#include <string>23 24typedef std::uint16_t char16;25 26struct string16_char_traits {27 typedef char16 char_type;28 typedef int int_type;29 30 typedef std::streamoff off_type;31 typedef std::mbstate_t state_type;32 typedef std::fpos<state_type> pos_type;33 34 static void assign(char_type&, const char_type&) {}35 static bool eq(const char_type&, const char_type&) { return false; }36 static bool lt(const char_type&, const char_type&) { return false; }37 static int compare(const char_type*, const char_type*, std::size_t) { return 0; }38 static std::size_t length(const char_type*) { return 0; }39 static const char_type* find(const char_type*, std::size_t, const char_type&) { return nullptr; }40 static char_type* move(char_type*, const char_type*, std::size_t) { return nullptr; }41 static char_type* copy(char_type*, const char_type*, std::size_t) { return nullptr; }42 static char_type* assign(char_type*, std::size_t, char_type) { return nullptr; }43 static int_type not_eof(const int_type&) { return 0; }44 static char_type to_char_type(const int_type&) { return char_type(); }45 static int_type to_int_type(const char_type&) { return int_type(); }46 static bool eq_int_type(const int_type&, const int_type&) { return false; }47 static int_type eof() { return int_type(); }48};49 50#if defined(TU1)51template class std::basic_string<char16, string16_char_traits>;52#else53extern template class std::basic_string<char16, string16_char_traits>;54 55int main(int, char**) {56 std::basic_string<char16, string16_char_traits> s;57 s.shrink_to_fit();58}59#endif60