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.. index:: ! contract
.. _contracts:
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Contracts
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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. A contract and its functions need to be called for anything to happen.
There is no "cron" concept in Ethereum to call a function at a particular event automatically.
.. 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
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