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Fix function type examples

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This commit is contained in:
Alex Beregszaszi 2016-11-21 13:11:43 +00:00
parent aa48008cc7
commit 42a84946d2
1 changed files with 11 additions and 5 deletions
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docs/types.rst
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@ -314,10 +314,13 @@ followed by the function identifier together in a single ``bytes24`` type.
Example that shows how to use internal function types::
pragma solidity ^0.4.5;
library ArrayUtils {
// internal functions can be used in internal library functions because
// they will be part of the same code context
function map(uint[] memory self, function (uint) returns (uint) f)
internal
returns (uint[] memory r)
{
r = new uint[](self.length);
@ -327,8 +330,9 @@ Example that shows how to use internal function types::
}
function reduce(
uint[] memory self,
function (uint) returns (uint) f
function (uint x, uint y) returns (uint) f
)
internal
returns (uint r)
{
r = self[0];
@ -336,7 +340,7 @@ Example that shows how to use internal function types::
r = f(r, self[i]);
}
}
function range(uint length) returns (uint[] memory r) {
function range(uint length) internal returns (uint[] memory r) {
r = new uint[](length);
for (uint i = 0; i < r.length; i++) {
r[i] = i;
@ -346,7 +350,7 @@ Example that shows how to use internal function types::
contract Pyramid {
using ArrayUtils for *;
function pyramid(uint l) return (uint) {
function pyramid(uint l) returns (uint) {
return ArrayUtils.range(l).map(square).reduce(sum);
}
function square(uint x) internal returns (uint) {
@ -359,6 +363,8 @@ Example that shows how to use internal function types::
Another example that uses external function types::
pragma solidity ^0.4.5;
contract Oracle {
struct Request {
bytes data;
@ -377,12 +383,12 @@ Another example that uses external function types::
}
contract OracleUser {
Oracle constant oracle = 0x1234567; // known contract
Oracle constant oracle = Oracle(0x1234567); // known contract
function buySomething() {
oracle.query("USD", oracleResponse);
}
function oracleResponse(bytes response) {
if (msg.sender != oracle) throw;
if (msg.sender != address(oracle)) throw;
// Use the data
}
}