396145d0da
Summary: This is a re-application of r357533 and r357531. They had been reverted because we thought the commits broke the LLDB data formatters, but it turns out this was because only r357531 had been included in the CI run. Before this patch, we would only ever throw an exception if the badbit was set on the stream. The Standard is currently very unclear on how exceptions should be propagated and what error flags should be set by the input stream operations. This commit changes libc++ to behave under a different (but valid) interpretation of the Standard. This interpretation of the Standard matches what other implementations are doing. This effectively implements the wording in p1264r0. It hasn't been voted into the Standard yet, however there is wide agreement that the fix is correct and it's just a matter of time before the fix is standardized. PR21586 PR15949 rdar://problem/15347558 Reviewers: mclow.lists, EricWF Subscribers: christof, dexonsmith, cfe-commits Differential Revision: https://reviews.llvm.org/D49863 llvm-svn: 357775
118 lines
2.7 KiB
C++
118 lines
2.7 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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// <istream>
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// template <class charT, class traits>
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// basic_istream<charT,traits>&
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// ws(basic_istream<charT,traits>& is);
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#include <istream>
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#include <cassert>
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#include "test_macros.h"
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template <class CharT>
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struct testbuf
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: public std::basic_streambuf<CharT>
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{
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typedef std::basic_string<CharT> string_type;
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typedef std::basic_streambuf<CharT> base;
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private:
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string_type str_;
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public:
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testbuf() {}
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testbuf(const string_type& str)
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: str_(str)
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{
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base::setg(const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()),
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const_cast<CharT*>(str_.data()) + str_.size());
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}
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CharT* eback() const {return base::eback();}
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CharT* gptr() const {return base::gptr();}
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CharT* egptr() const {return base::egptr();}
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};
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int main(int, char**)
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{
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{
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testbuf<char> sb(" 123");
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std::istream is(&sb);
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ws(is);
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assert(is.good());
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assert(is.peek() == '1');
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}
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{
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testbuf<wchar_t> sb(L" 123");
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std::wistream is(&sb);
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ws(is);
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assert(is.good());
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assert(is.peek() == L'1');
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}
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{
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testbuf<char> sb(" ");
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std::istream is(&sb);
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ws(is);
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assert(!is.fail());
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assert(is.eof());
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ws(is);
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assert(is.eof());
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assert(is.fail());
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}
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{
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testbuf<wchar_t> sb(L" ");
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std::wistream is(&sb);
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ws(is);
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assert(!is.fail());
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assert(is.eof());
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ws(is);
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assert(is.eof());
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assert(is.fail());
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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testbuf<char> sb(" ");
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std::basic_istream<char> is(&sb);
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is.exceptions(std::ios_base::eofbit);
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bool threw = false;
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try {
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std::ws(is);
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} catch (std::ios_base::failure const&) {
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threw = true;
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}
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assert(!is.bad());
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assert(!is.fail());
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assert( is.eof());
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assert(threw);
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}
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{
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testbuf<wchar_t> sb(L" ");
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std::basic_istream<wchar_t> is(&sb);
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is.exceptions(std::ios_base::eofbit);
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bool threw = false;
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try {
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std::ws(is);
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} catch (std::ios_base::failure const&) {
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threw = true;
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}
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assert(!is.bad());
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assert(!is.fail());
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assert( is.eof());
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assert(threw);
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}
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#endif
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return 0;
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}
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