Re: [boost] cw/template instantiation question

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-12-11 10:28:35

Howard Hinnant wrote:
> On Dec 11, 2005, at 7:29 AM, Arkadiy Vertleyb wrote:

...

>> typedef std::binder1st< int > type2; // error

...

> Are you sure you want to do things like this?  The type int does not
> meet the requirements for these template parameters.  For example in
> std::binder1st<Operation>, the requirements include:
>
> 1.  Operation has a nested type named first_argument_type.
> 2.  Operation has a nested type named second_argument_type.
> 3.  Operation has a nested type named result_type.

It doesn't matter. The requirements don't apply unless binder1st<int> is 
instantiated, and it isn't in the above example. binder1st<int> is still 
incomplete unless it's used in a context that demands a complete type. 
Unless the compiler has a bug, the only explanation is nonstandard default 
arguments.