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Subject: Re: [boost] [type_traits] adding is_less_comparable<T>, etc.
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-09-01 11:20:23

Steven Watanabe wrote:
> Once you know that operator< exists and returns non-void, you can
> use simple overload resolution.
> typedef char no;
> struct yes { no dummy[2]; };
> yes is_bool(bool);
> no is_bool(...);
> sizeof(is_bool(T() < U())) == sizeof(yes);

That assumes T and U have a default constructor. Use a factory function to create T's and U's instead.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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