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authorChris Ward <chriswhward@gmail.com>2018-11-15 18:59:37 +0800
committerchriseth <chris@ethereum.org>2018-12-03 18:49:42 +0800
commit78ca2801d8a63769bbd8cff5948c4b92d693d11c (patch)
tree63179e5cc7a4d2916864d5d1d851ad7db28bc3d0
parent0d1dd30ce84e77866e648219f4c84129fcb497e6 (diff)
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Move String literal and inline array FAQ items
Fix tab Update docs/types.rst Co-Authored-By: ChrisChinchilla <chriswhward@gmail.com> Update docs/types.rst Co-Authored-By: ChrisChinchilla <chriswhward@gmail.com>
-rw-r--r--docs/frequently-asked-questions.rst40
-rw-r--r--docs/types.rst35
2 files changed, 19 insertions, 56 deletions
diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst
index bcdfdcd8..f3c5b1f7 100644
--- a/docs/frequently-asked-questions.rst
+++ b/docs/frequently-asked-questions.rst
@@ -38,24 +38,6 @@ has it (which includes `Remix <https://remix.ethereum.org/>`_), then
``contractname.kill.sendTransaction({from:eth.coinbase})``, just the same as my
examples.
-Is it possible to in-line initialize an array like so: ``string[] myarray = ["a", "b"];``
-=========================================================================================
-
-Yes. However it should be noted that this currently only works with statically sized memory arrays. You can even create an inline memory
-array in the return statement.
-
-Example::
-
- pragma solidity >=0.4.16 <0.6.0;
-
- contract C {
- function f() public pure returns (uint8[5] memory) {
- string[4] memory adaArr = ["This", "is", "an", "array"];
- adaArr[0] = "That";
- return [1, 2, 3, 4, 5];
- }
- }
-
If I return an ``enum``, I only get integer values in web3.js. How to get the named values?
===========================================================================================
@@ -217,28 +199,6 @@ In this example::
}
}
-What is the relationship between ``bytes32`` and ``string``? Why is it that ``bytes32 somevar = "stringliteral";`` works and what does the saved 32-byte hex value mean?
-========================================================================================================================================================================
-
-The type ``bytes32`` can hold 32 (raw) bytes. In the assignment ``bytes32 samevar = "stringliteral";``,
-the string literal is interpreted in its raw byte form and if you inspect ``somevar`` and
-see a 32-byte hex value, this is just ``"stringliteral"`` in hex.
-
-The type ``bytes`` is similar, only that it can change its length.
-
-Finally, ``string`` is basically identical to ``bytes`` only that it is assumed
-to hold the UTF-8 encoding of a real string. Since ``string`` stores the
-data in UTF-8 encoding it is quite expensive to compute the number of
-characters in the string (the encoding of some characters takes more
-than a single byte). Because of that, ``string s; s.length`` is not yet
-supported and not even index access ``s[2]``. But if you want to access
-the low-level byte encoding of the string, you can use
-``bytes(s).length`` and ``bytes(s)[2]`` which will result in the number
-of bytes in the UTF-8 encoding of the string (not the number of
-characters) and the second byte (not character) of the UTF-8 encoded
-string, respectively.
-
-
Can a contract pass an array (static size) or string or ``bytes`` (dynamic size) to another contract?
=====================================================================================================
diff --git a/docs/types.rst b/docs/types.rst
index 69c846a6..f67a6d1a 100644
--- a/docs/types.rst
+++ b/docs/types.rst
@@ -465,11 +465,13 @@ a non-rational number).
.. index:: literal, literal;string, string
.. _string_literals:
-String Literals
----------------
+String Literals and Types
+-------------------------
String literals are written with either double or single-quotes (``"foo"`` or ``'bar'``). They do not imply trailing zeroes as in C; ``"foo"`` represents three bytes, not four. As with integer literals, their type can vary, but they are implicitly convertible to ``bytes1``, ..., ``bytes32``, if they fit, to ``bytes`` and to ``string``.
+For example, with ``bytes32 samevar = "stringliteral"`` the string literal is interpreted in its raw byte form when assigned to a ``bytes32`` type.
+
String literals support the following escape characters:
- ``\<newline>`` (escapes an actual newline)
@@ -862,13 +864,20 @@ or create a new memory array and copy every element.
}
}
-.. index:: ! array;literals, !inline;arrays
+.. index:: ! array;literals, ! inline;arrays
+
+Array Literals
+^^^^^^^^^^^^^^
+
+An array literal is a comma-separated list of one or more expressions, enclosed
+in square brackets (``[...]``). For example ``[1, a, f(3)]``. There must be a
+common type all elements can be implicitly converted to. This is the elementary
+type of the array.
-Array Literals / Inline Arrays
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Array literals are always statically-sized memory arrays.
-Array literals are arrays that are written as an expression and are not
-assigned to a variable right away.
+In the example below, the type of ``[1, 2, 3]`` is
+``uint8[3] memory``. Because the type of each of these constants is ``uint8``, if you want the result to be a ``uint[3] memory`` type, you need to convert the first element to ``uint``.
::
@@ -883,13 +892,7 @@ assigned to a variable right away.
}
}
-The type of an array literal is a memory array of fixed size whose base
-type is the common type of the given elements. The type of ``[1, 2, 3]`` is
-``uint8[3] memory``, because the type of each of these constants is ``uint8``.
-Because of that, it is necessary to convert the first element in the example
-above to ``uint``. Note that currently, fixed size memory arrays cannot
-be assigned to dynamically-sized memory arrays, i.e. the following is not
-possible:
+Fixed size memory arrays cannot be assigned to dynamically-sized memory arrays, i.e. the following is not possible:
::
@@ -904,8 +907,8 @@ possible:
}
}
-It is planned to remove this restriction in the future but currently creates
-some complications because of how arrays are passed in the ABI.
+It is planned to remove this restriction in the future, but it creates some
+complications because of how arrays are passed in the ABI.
.. index:: ! array;length, length, push, pop, !array;push, !array;pop