absolute value of vector of vertors

This code does not compile.

    TNL::Containers::Vector<TNL::Containers::StaticVector<3,int>, TNL::Devices::Host, size_t> vec;

    vec.setSize(2);
    vec = TNL::Containers::StaticVector<3,int>{1,-2,3};
    TNL::abs(a); // error

The compiler does not see this funciton from the context of function Abs::evaluate:

////
// Abs
template< int Size, typename Real >
__cuda_callable__
auto
abs( const Containers::StaticVector< Size, Real >& a )
{
   return Containers::Expressions::StaticUnaryExpressionTemplate< Containers::StaticVector< Size, Real >, Containers::Expressions::Abs >( a );
}

and the only visible function from the context is this one.

template< class T,
          std::enable_if_t< ! std::is_unsigned<T>::value, bool > = true>
__cuda_callable__ inline
T abs( const T& n );

It does not apply the right function because the function abs( const Containers::StaticVector< Size, Real >& a ) is in the namespace TNL instead of TNL::Containers as its argument is. Moreover, the Abs::evaluate calls TNL::abs which does not trigger ADL (argument dependent lookup), see this. By the way that is the reason why operators +,-, etc. works properly. The same problem applies to other expression functions.