[boost] Suggestion for Boost.Function

[Daryle Walker]

I don't know anything about Boost.Function except what I've seen checking out the sample documentations. I have some thoughts on the == and != operators.

You have poisoned (in)equality operators, because of your safe_bool type. Are you using a data pointer type, like "void *" that the IOStreams use for their safe-Boolean type? If so, you should switch to an even more useless type. I used member-pointers for my modulo class template (in the Sandbox).

template < int N >
class modulo
{
typename modulo self_type;

int r_;

public:
typename int self_type::* safe_bool;

operator safe_bool() const;
//...
};

Here, I used a safe_bool type that was based on the particular version of the class template, preventing cross-version comparisons. I have a valid (in)equality operators; if you don't want that either, then provide declarations for those operators as member functions, but make them private.

Daryle

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