Add a macro for easy definition of lookup functions.
Add a macro for easy definition of lookup functions.

simonwagner/grantlee,simonwagner/grantlee,cutelyst/grantlee,cutelyst/grantlee,cutelyst/grantlee,simonwagner/grantlee,simonwagner/grantlee,simonwagner/grantlee,simonwagner/grantlee,cutelyst/grantlee,cutelyst/grantlee