make_streamable()

template<typename T >

auto kumi::_::make_streamable

(

T const &

e

)

#include <kumi/detail/streamable.hpp>

Provides an extension point as_streamable in order to output types with no stream operator defined.

Note

This function is an implementation detail and only documented to show how to use the as_streamable extension point.

Template Parameters

T	Type of the element to output.

Parameters

e	The value of the element to output.

Returns

A value that can be passed to an output stream.

Example:

 
#include <kumi/kumi.hpp>
#include <iostream>
#include <string>
#include <cstdint>
 
namespace ns
{
  struct price
  {
      std::uint64_t integer;
      std::uint64_t decimal;
  };
 
  auto as_streamable(price const& p)
  {
    return std::to_string(p.integer) + "."
         + std::to_string(p.decimal);
  }
}
 
int main()
{
  ns::price baguette{1, 50};
  ns::price cards   {7, 90};
  
  kumi::tuple shop_list = {baguette, cards};
  std::cout << shop_list << "\n";
}