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Migrate contracts to Solidity 0.7 (#2319)

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* Update contract pragmas to solidity 0.7

* Remove internal declaration on constructors

* Reference SafeMath explicitely

* Remove public constructor declaration from abstract contracts

* Remove public constructor declaration from non-abstract contracts
This commit is contained in:
Elena Gesheva
2020-07-30 00:11:32 +03:00
committed by GitHub
parent 09014f90f9
commit 04fc35707d
125 changed files with 194 additions and 193 deletions
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6
docs/modules/ROOT/pages/extending-contracts.adoc
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@ -20,7 +20,7 @@ For example, imagine you want to change xref:api:access.adoc#AccessControl[`Acce
```solidity
// contracts/ModifiedAccessControl.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
pragma solidity ^0.7.0;
import "@openzeppelin/contracts/access/AccessControl.sol";
@ -48,7 +48,7 @@ Here is a modified version of xref:api:access.adoc#AccessControl[`AccessControl`
```solidity
// contracts/ModifiedAccessControl.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
pragma solidity ^0.7.0;
import "@openzeppelin/contracts/access/AccessControl.sol";
@ -80,7 +80,7 @@ Hooks are simply functions that are called before or after some action takes pla
Here's how you would implement the `IERC721Receiver` pattern in `ERC20`, using the xref:api:token/ERC20.adoc#ERC20-_beforeTokenTransfer-address-address-uint256-[`_beforeTokenTransfer`] hook:
```solidity
pragma solidity ^0.6.0;
pragma solidity ^0.7.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";