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authorChris Ward <chriswhward@gmail.com>2018-11-15 19:11:25 +0800
committerChris Ward <chriswhward@gmail.com>2018-11-15 19:11:25 +0800
commit9b657134ef33a5a01dd09d8fcd7a13922bb7aaa4 (patch)
tree3492dc82f2574ac678d418c630201fd863a71828 /docs
parent9db76403bb378e3b36bde8b42794ad6da0262ec9 (diff)
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Remove length related FAQ item
Diffstat (limited to 'docs')
-rw-r--r--docs/frequently-asked-questions.rst44
-rw-r--r--docs/types.rst4
2 files changed, 3 insertions, 45 deletions
diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst
index 8b655b0d..985d8d3c 100644
--- a/docs/frequently-asked-questions.rst
+++ b/docs/frequently-asked-questions.rst
@@ -325,50 +325,6 @@ to create an independent copy of the storage value in memory.
On the other hand, ``h(x)`` successfully modifies ``x`` because only
a reference and not a copy is passed.
-Sometimes, when I try to change the length of an array with ex: ``arrayname.length = 7;`` I get a compiler error ``Value must be an lvalue``. Why?
-==================================================================================================================================================
-
-You can resize a dynamic array in storage (i.e. an array declared at the
-contract level) with ``arrayname.length = <some new length>;``. If you get the
-"lvalue" error, you are probably doing one of two things wrong.
-
-1. You might be trying to resize an array in "memory", or
-
-2. You might be trying to resize a non-dynamic array.
-
-::
-
- pragma solidity >=0.4.18 <0.6.0;
-
- // This will not compile
- contract C {
- int8[] dynamicStorageArray;
- int8[5] fixedStorageArray;
-
- function f() public {
- int8[] memory memArr; // Case 1
- memArr.length++; // illegal
-
- int8[5] storage storageArr = fixedStorageArray; // Case 2
- storageArr.length++; // illegal
-
- int8[] storage storageArr2 = dynamicStorageArray;
- storageArr2.length++; // legal
-
-
- }
- }
-
-**Important note:** In Solidity, array dimensions are declared backwards from the way you
-might be used to declaring them in C or Java, but they are access as in
-C or Java.
-
-For example, ``int8[][5] somearray;`` are 5 dynamic ``int8`` arrays.
-
-The reason for this is that ``T[5]`` is always an array of 5 ``T``'s,
-no matter whether ``T`` itself is an array or not (this is not the
-case in C or Java).
-
Is it possible to return an array of strings (``string[]``) from a Solidity function?
=====================================================================================
diff --git a/docs/types.rst b/docs/types.rst
index 020cb105..b84d3222 100644
--- a/docs/types.rst
+++ b/docs/types.rst
@@ -913,7 +913,9 @@ Members
For dynamically-sized arrays (only available for storage), this member can be assigned to resize the array.
Accessing elements outside the current length does not automatically resize the array and instead causes a failing assertion.
Increasing the length adds new zero-initialised elements to the array.
- Reducing the length performs an implicit :ref:``delete`` on each of the removed elements.
+ Reducing the length performs an implicit :ref:``delete`` on each of the
+ removed elements. If you try to resize a non-dynamic array that isn't in
+ storage, you receive a ``Value must be an lvalue`` error.
**push**:
Dynamic storage arrays and ``bytes`` (not ``string``) have a member function called ``push`` that you can use to append an element at the end of the array. The element will be zero-initialised. The function returns the new length.
**pop**: