David Abrahams wrote:
>
> FWIW, Boost.Function is overkill for many simple cases. This might
> be a case where the FS library should just provide a class with a
> virtual function:
>
> struct checker
> {
> virtual ~checker() {}
> virtual bool operator()( std string const& ) = 0;
>
> shared_ptr<checker> next; // suggested.
> };
Boost.Function makes things simpler for the user.
enum check_type { check_posix, check_windows, ... };
bool my_name_checker(std::string const & s, check_type t);
Compare
bind(my_name_checker, _1, check_posix)
against
struct my_name_checker_: public checker
{
check_type t_;
my_name_checker_(check_type t): t_(t) {}
bool operator()( std::string const & s)
{
return my_name_checker(s, t_);
}
};
It is still possible to substitute a homegrown function<bool(string)> (or
function<bool(char const *)>) equivalent for portability reasons, of course.
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