28 Numerics library [numerics]

28.9 Basic linear algebra algorithms [linalg]

28.9.4 Requirements [linalg.reqs] Linear algebra value types [linalg.reqs.val]

Throughout [linalg], the following types are linear algebra value type:
  • the value_type type alias of any input or output mdspan parameter(s) of any function in [linalg]; and
  • the Scalar template parameter (if any) of any function or class in [linalg].
Linear algebra value types shall model semiregular.
A value-initialized object of linear algebra value type shall act as the additive identity.