[llvm-bugs] [Bug 24933] std::basic_string requires Allocator to have a default constructor

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24933

Jesse Hall <jhall1024+llvmbugs at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Jesse Hall <jhall1024+llvmbugs at gmail.com> ---
You're right. I'm terribly sorry. I was trying to simplify from something more
complex, came up with the same error, and assumed I'd simplified correctly.

For what it's worth, the real problem is essentially:

typedef std::basic_string<char, std::char_traits<char>, MyAllocator<char>>
MyString;
typedef std::unordered_map<MyString, void*, std::hash<MyString>,
std::equal_to<MyString>, MyAllocator<std::pair<const MyString, void*>>>
MyUnorderedMap;
...
MyUnorderedMap um;
um.insert(std::make_pair(str, ptr));

Something in insert() is default-constructing the pair<MyString,void*>, which
default-constructs MyString, and fails.

I'll go do my homework properly this time and figure out if this is
expected/correct, and if so, whether there's a valid way to avoid the default
construction.

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