838f2890fd
Add test coverage for the new behaviors, especially to verify that the returned string uses the correct allocator. Fixes https://github.com/llvm/llvm-project/issues/64644 Migrated from https://reviews.llvm.org/D157776 — @philnik777 @pfusik @ldionne @mordante please take another look!
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <sstream>
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// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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// class basic_stringbuf
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// basic_string_view<charT, traits> view() const noexcept;
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#include <sstream>
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#include <cassert>
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#include <type_traits>
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#include "make_string.h"
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#include "test_macros.h"
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#define STR(S) MAKE_STRING(CharT, S)
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#define SV(S) MAKE_STRING_VIEW(CharT, S)
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template <class CharT>
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struct my_char_traits : public std::char_traits<CharT> {};
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template <class CharT>
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static void test() {
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std::basic_stringbuf<CharT> buf(STR("testing"));
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static_assert(noexcept(buf.view()));
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assert(buf.view() == SV("testing"));
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buf.str(STR("another test"));
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assert(buf.view() == SV("another test"));
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std::basic_stringbuf<CharT> robuf(STR("foo"), std::ios_base::in);
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assert(robuf.view() == SV("foo"));
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std::basic_stringbuf<CharT> nbuf(STR("not used"), 0);
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assert(nbuf.view() == std::basic_string_view<CharT>());
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const std::basic_stringbuf<CharT> cbuf(STR("abc"));
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static_assert(noexcept(cbuf.view()));
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assert(cbuf.view() == SV("abc"));
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std::basic_stringbuf<CharT, my_char_traits<CharT>> tbuf;
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static_assert(std::is_same_v<decltype(tbuf.view()), std::basic_string_view<CharT, my_char_traits<CharT>>>);
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}
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struct StringBuf : std::stringbuf {
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using basic_stringbuf::basic_stringbuf;
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void public_setg(int a, int b, int c) {
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char* p = eback();
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this->setg(p + a, p + b, p + c);
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}
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};
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static void test_altered_sequence_pointers() {
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{
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auto src = StringBuf("hello world", std::ios_base::in);
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src.public_setg(4, 6, 9);
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std::stringbuf dest;
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dest = std::move(src);
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assert(dest.view() == dest.str());
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LIBCPP_ASSERT(dest.view() == "o wor");
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}
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{
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auto src = StringBuf("hello world", std::ios_base::in);
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src.public_setg(4, 6, 9);
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std::stringbuf dest;
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dest.swap(src);
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assert(dest.view() == dest.str());
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LIBCPP_ASSERT(dest.view() == "o wor");
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}
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}
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int main(int, char**) {
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test<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test<wchar_t>();
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#endif
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test_altered_sequence_pointers();
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return 0;
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}
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