b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
104 lines
3.1 KiB
C++
104 lines
3.1 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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// <sstream>
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// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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// class basic_stringstream
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// explicit basic_stringstream(const basic_string<charT,traits,Allocator>& str,
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// ios_base::openmode which = ios_base::out|ios_base::in);
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// XFAIL: FROZEN-CXX03-HEADERS-FIXME
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#include <sstream>
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#include <cassert>
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#include "test_macros.h"
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#include "operator_hijacker.h"
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template<typename T>
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struct NoDefaultAllocator : std::allocator<T>
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{
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template<typename U> struct rebind { using other = NoDefaultAllocator<U>; };
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NoDefaultAllocator(int id_) : id(id_) { }
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template<typename U> NoDefaultAllocator(const NoDefaultAllocator<U>& a) : id(a.id) { }
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int id;
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};
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int main(int, char**)
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{
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{
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std::stringstream ss(" 123 456 ");
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assert(ss.rdbuf() != nullptr);
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assert(ss.good());
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assert(ss.str() == " 123 456 ");
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int i = 0;
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ss >> i;
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assert(i == 123);
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ss >> i;
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assert(i == 456);
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ss << i << ' ' << 123;
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assert(ss.str() == "456 1236 ");
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}
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{
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std::basic_stringstream<char, std::char_traits<char>, operator_hijacker_allocator<char> > ss(" 123 456 ");
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assert(ss.rdbuf() != nullptr);
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assert(ss.good());
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assert(ss.str() == " 123 456 ");
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int i = 0;
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ss >> i;
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assert(i == 123);
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ss >> i;
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assert(i == 456);
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ss << i << ' ' << 123;
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assert(ss.str() == "456 1236 ");
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}
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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std::wstringstream ss(L" 123 456 ");
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assert(ss.rdbuf() != nullptr);
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assert(ss.good());
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assert(ss.str() == L" 123 456 ");
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int i = 0;
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ss >> i;
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assert(i == 123);
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ss >> i;
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assert(i == 456);
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ss << i << ' ' << 123;
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assert(ss.str() == L"456 1236 ");
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}
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{
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std::basic_stringstream<wchar_t, std::char_traits<wchar_t>, operator_hijacker_allocator<wchar_t> > ss(
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L" 123 456 ");
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assert(ss.rdbuf() != nullptr);
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assert(ss.good());
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assert(ss.str() == L" 123 456 ");
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int i = 0;
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ss >> i;
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assert(i == 123);
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ss >> i;
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assert(i == 456);
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ss << i << ' ' << 123;
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assert(ss.str() == L"456 1236 ");
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}
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#endif
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{ // This is https://llvm.org/PR33727
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typedef std::basic_string <char, std::char_traits<char>, NoDefaultAllocator<char> > S;
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typedef std::basic_stringbuf<char, std::char_traits<char>, NoDefaultAllocator<char> > SB;
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S s(NoDefaultAllocator<char>(1));
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SB sb(s);
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// This test is not required by the standard, but *where else* could it get the allocator?
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assert(sb.str().get_allocator() == s.get_allocator());
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}
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return 0;
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}
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