consider_types

Detailed Description

Adds types to the cardinal selection.

Variables
template<typename ... Ts>
auto	eve::algo::consider_types = ( consider_types_key = kumi::tuple<Ts...>{} )
	A trait that tells the algorithm to take an extra type into account when selecting a width. This is, for example, used by reduce algorithm to consider the sum type.

Variable Documentation

consider_types

template<typename ... Ts>

auto eve::algo::consider_types = ( consider_types_key = kumi::tuple<Ts...>{} )

A trait that tells the algorithm to take an extra type into account when selecting a width. This is, for example, used by reduce algorithm to consider the sum type.

namespace eve::algo
{
  template<typename... Ts> auto consider_types = eve_implementation_defined;
}

Template Parameters

Ts	Extra types the selection weighs.

Adds Ts to the types the cardinal selection is based on. By default the cardinal of an algorithm is chosen from the types of its range; if the computation widens on the way, as a sum into a larger type does, the wider type is to be taken into account as well.

std::vector<float> data(1024);
 
// The body computes in double: with double weighed, the cardinal halves and a double
// value holds in one register rather than two.
transform_inplace[consider_types<double>](data, [](auto x) {
  auto d = eve::convert(x, eve::as<double>{});
  return eve::convert(eve::exp(d), eve::as<float>{});
});

See also

force_cardinal, eve::algo::views::convert