A C++ template library for embedded applications
MIT licensed
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Designed and
maintained by
John Wellbelove
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null_type

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
null_type.h