Re: [boost] [type_erasure] Review started (July 18-27, 2012)

Subject: Re: [boost] [type_erasure] Review started (July 18-27, 2012)
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2012-08-07 18:28:41

AMDG

On 08/07/2012 10:45 AM, Paul A. Bristow wrote:
> 
> This specialization of ostreamable:
> 
> template<>
> struct ostreamable<class Os, const std::pair<const int, double>& >
> {
>     static void apply(Os& out, const std::pair<const int, double>& arg)
>     {
>       out << arg; // No operator<< of type 'Os'
>    }
> };
> 
> still doesn't resolve the requirement.
> 

This is an explicit specialization which uses a
class called Os.  I think you intended a partial
specialization:

template<class Os>
struct ostreamable<Os, std::pair<const int, double> >;

> type_erasure_print_map.cpp(140): error C2678: binary '<<' : no operator found which takes a
> left-hand operand of type 'Os' (or there is no acceptable conversion)
> 

In Christ,
Steven Watanabe