cheng/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mentioned the fact that wxArray can't be used for storing floats/doubles

Browse Source 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1685 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 1999-02-12 13:55:22 +00:00
parent cba2db0c29
commit b2ff82b9fd
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
docs/latex/wx/array.tex
View File

@ -39,7 +39,14 @@ deleted when the element is removed from the array. It should be noted that
all of wxArray's functions are inline, so it costs strictly nothing to define as
many array types as you want (either in terms of the executable size or the
speed) as long as at least one of them is defined and this is always the case
because wxArrays are used by wxWindows internally.
because wxArrays are used by wxWindows internally. This class has one serious
limitation: it can only be used for storing integral types (bool, char, short,
int, long and their unsigned variants) or pointers (of any kind). An attempt
to use with objects of sizeof() greater than sizeof(long) will provoke a
runtime assertion failure, however declaring a wxArray of floats will not (on
the machines where sizeof(float) <= sizeof(long)), yet it will {\bf not} work,
please use wxObjArray for storing floats and doubles (NB: a more efficient
wxArrayDouble class is scheduled for the next release of wxWindows).
wxSortedArray is a wxArray variant which should be used when searching in the
array is a frequently used operation. It requires you to define an additional
@ -51,9 +58,8 @@ slower: it is $O(log(N))$ instead of constant time (neglecting time spent in
memory allocation routine). However, in a usual situation elements are added to
an array much less often than searched inside it, so wxSortedArray may lead to
huge performance improvements compared to wxArray. Finally, it should be
noticed that, as wxArray, wxSortedArray can not be used to store anything of
sizeof() larger than max(sizeof(long), sizeof(void *)) - an assertion failure
will be raised from the constructor otherwise.
noticed that, as wxArray, wxSortedArray can be only used for storing integral
types or pointers.
wxObjArray class treats its elements like "objects". It may delete them when
they are removed from the array (invoking the correct destructor) and copies