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Enhance documentation about usage of value and gas

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People might look for information in the members section of the function types chapter.
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Mathias Baumann 2019-02-12 16:58:04 +01:00
parent f16c02b2ba
commit 8d3f0a16a3
2 changed files with 13 additions and 5 deletions
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docs/control-structures.rst
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@ -91,7 +91,7 @@ You need to use the modifier ``payable`` with the ``info`` function because
otherwise, the ``.value()`` option would not be available.
.. warning::
Be careful that ``feed.info.value(10).gas(800)`` only locally sets the ``value`` and amount of ``gas`` sent with the function call, and the parentheses at the end perform the actual call. So in this case, the function is not called.
Be careful that ``feed.info.value(10).gas(800)`` only locally sets the ``value`` and amount of ``gas`` sent with the function call, and the parentheses at the end perform the actual call. So in this case, the function is not called and the ``value`` and ``gas`` settings are lost.
Function calls cause exceptions if the called contract does not exist (in the
sense that the account does not contain code) or if the called contract itself

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docs/types/value-types.rst
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@ -614,15 +614,23 @@ just use ``f``, if you want to use its external form, use ``this.f``.
Members:
Public (or external) functions also have a special member called ``selector``,
which returns the :ref:`ABI function selector <abi_function_selector>`::
Public (or external) functions have the following members:
* ``.selector`` returns the :ref:`ABI function selector <abi_function_selector>`
* ``.gas(uint)`` returns a callable function object which, when called, will send the specified amount of gas to the target function. See :ref:`External Function Calls <external-function-calls>` for more information.
* ``.value(uint)`` returns a callable function object which, when called, will send the specified amount of wei to the target function. See :ref:`External Function Calls <external-function-calls>` for more information.
Example that shows how to use the members::
pragma solidity >=0.4.16 <0.6.0;
contract Selector {
function f() public pure returns (bytes4) {
contract Example {
function f() public payable returns (bytes4) {
return this.f.selector;
}
function g() public {
this.f.gas(10).value(800)();
}
}
Example that shows how to use internal function types::