Re: stream operators for number

From: John Maddock (jz.maddock_at_[hidden])
Date: 2022-08-13 12:01:20

On 13/08/2022 12:26, Gero Peterhoff via Boost wrote:
> Hello,
> can you please provide the << and >> operators for 
> boost::multiprecision::number as a stream template?
>
> currently (fixed ostream)
> template <class Backend, expression_template_option ExpressionTemplates>
> std::ostream& operator<<(std::ostream& os, const number<Backend, 
> ExpressionTemplates>&)
>
> useful
> template <typename Char, typename Traits, typename Backend, 
> expression_template_option ExpressionTemplates>
> std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, 
> Traits>& stream, const number<Backend, ExpressionTemplates>&)

I dodged that when first writing multiprecision because some backends 
(all those that are external C libraries) have narrow character 
conversions only.

So far - and somewhat to my surprise - not one person has requested 
template iostream operators.  Do you have a concrete use case?

Best, John.