[Patch] First bits of the algo merge

[Gabriel Dos Reis]

Howard Hinnant <hhinnant@apple.com> writes:

| It should look more like:
| 
| template <class _Lhs, class _Rhs = _Lhs>
| struct equal_to
| {
|      bool operator()(const _Lhs& __lhs, const _Lhs& __rhs) const
| {return __lhs == __rhs;}
|      bool operator()(const _Lhs& __lhs, const _Rhs& __rhs) const
| {return __lhs == __rhs;}
|      bool operator()(const _Rhs& __lhs, const _Lhs& __rhs) const
| {return __lhs == __rhs;}
|      bool operator()(const _Rhs& __lhs, const _Rhs& __rhs) const
| {return __lhs == __rhs;}
| };

How is that "better" than the original implementation?

-- Gaby