Fix PR33727: std::basic_stringbuf only works with DefaultConstructible allocators. Thanks to Jonathan Wakely for the report and suggested fix
llvm-svn: 309838
diff --git a/libcxx/include/sstream b/libcxx/include/sstream
index b9903f9..fe65fd7 100644
--- a/libcxx/include/sstream
+++ b/libcxx/include/sstream
@@ -249,7 +249,8 @@
template <class _CharT, class _Traits, class _Allocator>
basic_stringbuf<_CharT, _Traits, _Allocator>::basic_stringbuf(const string_type& __s,
ios_base::openmode __wch)
- : __hm_(0),
+ : __str_(__s.get_allocator()),
+ __hm_(0),
__mode_(__wch)
{
str(__s);
diff --git a/libcxx/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp b/libcxx/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
index 3776f17..43b9df6 100644
--- a/libcxx/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
+++ b/libcxx/test/std/input.output/string.streams/stringstream.cons/string.pass.cpp
@@ -18,6 +18,16 @@
#include <sstream>
#include <cassert>
+template<typename T>
+struct NoDefaultAllocator : std::allocator<T>
+{
+ template<typename U> struct rebind { using other = NoDefaultAllocator<U>; };
+ NoDefaultAllocator(int id) : id(id) { }
+ template<typename U> NoDefaultAllocator(const NoDefaultAllocator<U>& a) : id(a.id) { }
+ int id;
+};
+
+
int main()
{
{
@@ -46,4 +56,13 @@
ss << i << ' ' << 123;
assert(ss.str() == L"456 1236 ");
}
+ { // This is https://bugs.llvm.org/show_bug.cgi?id=33727
+ typedef std::basic_string <char, std::char_traits<char>, NoDefaultAllocator<char> > S;
+ typedef std::basic_stringbuf<char, std::char_traits<char>, NoDefaultAllocator<char> > SB;
+
+ S s(NoDefaultAllocator<char>(1));
+ SB sb(s);
+ // This test is not required by the standard, but *where else* could it get the allocator?
+ assert(sb.str().get_allocator() == s.get_allocator());
+ }
}