is_perm_fermionic()

template<Rank rank>

bool syten::is_perm_fermionic	(	TensorBlock< rank > const &	in,
		ConstSpan< int >	perms,
		ConstSpan< Index >	current_order
	)

Returns true if swapping the legs of in as to conform to perm induces a fermionic factor.

References std::array< T >::begin(), std::array< T >::end(), std::iota(), minus_on_swap(), rank(), std::swap(), SYTEN_ASSERT, and syten::TensorBlock< rank >::trans().

Referenced by syten::STensorImpl::change_fermionic_order(), and syten::TensorProd::prod_impl().

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