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Document precedence #732

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Aug 1, 2016
Merged

Document precedence #732

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dfe55a9
Create order of precedence table
Denton-L Jul 20, 2016
5d09211
Add link to operator table
Denton-L Jul 20, 2016
1ec74f8
Remove comma operator
Denton-L Jul 26, 2016
ca5e6a6
Fix assignment operators
Denton-L Jul 26, 2016
7143815
Revert "Remove comma operator"
Denton-L Jul 27, 2016
8bf96b1
Remove >>> and >>>= operators
Denton-L Jul 27, 2016
7a20324
Link to order of precedence table
Denton-L Jul 28, 2016
5687beb
Add unary operations to the table
Denton-L Jul 28, 2016
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60 changes: 59 additions & 1 deletion docs/miscellaneous.rst
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Expand Up @@ -149,6 +149,65 @@ Tips and Tricks
Cheatsheet
**********

.. index:: precedence

.. _order:

Order of Precedence of Operators
================================

The following is the order of precedence for operators, listed in order of evaluation.

+------------+-------------------------------------+--------------------------------------------+
| Precedence | Description | Operator |
+============+=====================================+============================================+
| *1* | Postfix increment and decrement | ``++``, ``--`` |
+ +-------------------------------------+--------------------------------------------+
| | Function-like call | ``<func>(<args...>)`` |
+ +-------------------------------------+--------------------------------------------+
| | Array subscripting | ``<array>[<index>]`` |
+ +-------------------------------------+--------------------------------------------+
| | Member access | ``<object>.<member>`` |
+ +-------------------------------------+--------------------------------------------+
| | Parentheses | ``(<statement>)`` |
+------------+-------------------------------------+--------------------------------------------+
| *2* | Prefix increment and decrement | ``++``, ``--`` |
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Please also add after and delete

https://github.com/ethereum/solidity/blob/d593166d66dba3f95df9d4096f45761ca0f86626/libsolidity/codegen/ExpressionCompiler.cpp#L300,L303

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@Denton-L Denton-L Jul 27, 2016 •
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Alright, will do. Out of curiosity, what does the after keyword do?

@NicolaiSoeborg

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I think it can be used as var deadline = after 2 weeks; and now deadline will be current block timestamp + (2 * 7 * 24 * 60 * 60).

+ +-------------------------------------+--------------------------------------------+
| | Unary plus and minus | ``+``, ``-`` |
+ +-------------------------------------+--------------------------------------------+
| | Logical NOT | ``!`` |
+ +-------------------------------------+--------------------------------------------+
| | Bitwise NOT | ``~`` |
+------------+-------------------------------------+--------------------------------------------+
| *3* | Exponentiation | ``**`` |
+------------+-------------------------------------+--------------------------------------------+
| *4* | Multiplication, division and modulo | ``*``, ``/``, ``%`` |
+------------+-------------------------------------+--------------------------------------------+
| *5* | Addition and subtraction | ``+``, ``-`` |
+------------+-------------------------------------+--------------------------------------------+
| *6* | Bitwise shift operators | ``<<``, ``>>``, ``>>>`` |
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Please remove >>>, it is really not used.

+------------+-------------------------------------+--------------------------------------------+
| *7* | Bitwise AND | ``&`` |
+------------+-------------------------------------+--------------------------------------------+
| *8* | Bitwise XOR | ``^`` |
+------------+-------------------------------------+--------------------------------------------+
| *9* | Bitwise OR | ``|`` |
+------------+-------------------------------------+--------------------------------------------+
| *10* | Inequality operators | ``<``, ``>``, ``<=``, ``>=`` |
+------------+-------------------------------------+--------------------------------------------+
| *11* | Equality operators | ``==``, ``!=`` |
+------------+-------------------------------------+--------------------------------------------+
| *12* | Logical AND | ``&&`` |
+------------+-------------------------------------+--------------------------------------------+
| *13* | Logical OR | ``||`` |
+------------+-------------------------------------+--------------------------------------------+
| *14* | Ternary operator | ``<conditional> ? <if-true> : <if-false>`` |
+------------+-------------------------------------+--------------------------------------------+
| *15* | Assignment operators | ``=``, ``|=``, ``^=``, ``&=``, ``<<=``, |
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Please remove >>>=.

| | | ``>>=``, ``>>>=``, ``+=``, ``-=``, ``*=``, |
| | | ``/=``, ``%=`` |
+------------+-------------------------------------+--------------------------------------------+

.. index:: block, coinbase, difficulty, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, now, gas price, origin, sha3, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send

Global Variables
Expand Down Expand Up @@ -205,4 +264,3 @@ Modifiers
- ``constant`` for functions: Disallows modification of state - this is not enforced yet.
- ``anonymous`` for events: Does not store event signature as topic.
- ``indexed`` for event parameters: Stores the parameter as topic.

3 changes: 3 additions & 0 deletions docs/types.rst
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Expand Up @@ -12,6 +12,9 @@ see :ref:`type-deduction` below) at
compile-time. Solidity provides several elementary types which can be combined
to form complex types.

In addition, types can interact with each other in expressions containing
operators. For a quick reference of the various operators, see :ref:`order`.

.. index:: ! value type, ! type;value

Value Types
Expand Down