https://bugs.llvm.org/show_bug.cgi?id=33727
Bug ID: 33727
Summary: std::basic_stringbuf only works with
DefaultConstructible allocators
Product: libc++
Version: 4.0
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
This doesn't compile:
#include <memory>
#include <sstream>
#include <cassert>
template<typename T>
struct Alloc : std::allocator<T>
{
template<typename U> struct rebind { using other = Alloc<U>; };
Alloc(int id) : id(id) { }
template<typename U> Alloc(const Alloc<U>& a) : id(a.id) { }
int id;
};
using string = std::basic_string<char, std::char_traits<char>, Alloc<char>>;
using stringbuf = std::basic_stringbuf<char, std::char_traits<char>,
Alloc<char>>;
int main()
{
string s(Alloc<char>(1));
stringbuf b(s);
assert( b.str().get_allocator() == s.get_allocator() );
}
The basic_stringbuf constructor default-initializes its basic_string member,
which default-initializes its allocator.
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