etl/docs/utilities/null-type.md

title
null_type

{{< callout type="info">}} Header: null_type.h
Since: TBC
{{< /callout >}}

A placeholder type to use as unique default types in a list of template type parameters.

template <size_t N>
class null_type
{
};

Example

template <typename T1 = etl::null_type<1>, typename T2 = etl::null_type<2>>
class MyClass