feos-derive is part of the FeOs project.
FeOs - A Framework for Equations of State and Classical Density Functional Theory
The feos-derive crate contains two macros that provide boilerplate for the implementation of the EquationOfState and the HelmholtzEnergyFunctional trait for the EosVariant and FunctionalVariant enums of the feos crate. With these macros, new equations of state and functionals can be added to the variants without any further implementations needed.