.. index:: ! contract .. _contracts: ########## Contracts ########## Contracts in Solidity are similar to classes in object-oriented languages. They contain persistent data in state variables and functions that can modify these variables. Calling a function on a different contract (instance) will perform an EVM function call and thus switch the context such that state variables are inaccessible. .. include:: contracts/creating-contracts.rst .. include:: contracts/visibility-and-getters.rst .. include:: contracts/function-modifiers.rst .. include:: contracts/constant-state-variables.rst .. include:: contracts/functions.rst .. include:: contracts/events.rst .. include:: contracts/inheritance.rst .. include:: contracts/abstract-contracts.rst .. include:: contracts/interfaces.rst .. include:: contracts/libraries.rst .. include:: contracts/using-for.rst