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From: deansturtevant_at_[hidden]
Date: 2000-12-18 17:51:40

--- In boost_at_[hidden], Jesse Jones <jejones_at_a...> wrote:
> >
> >typedef bool (*assertion_failure_fcn)(void* arg, const char* file,
> >unsigned line, const char* message);
> What's arg for?
It's a standard technique when defining callbacks. It allows the
client to specify data associated with the callback. Perhaps a
superior approach is:

class assertion_failure_handler
    virtual bool handle_assertion_failure(
        const char* file, unsigned line, const char* message) = 0;

void set_assertion_failure_handler(assertion_failure_handler*);

Note that the callback's name is very descriptive. That's my taste,
and comes in useful for classes that derive from multiple bases.

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