mxGetPropertyPtr & mxSetPropertySDC C-mex functions
When The Mathworks® introduced MATLAB® version R2008a they included a new object oriented format called classdef. This addition greatly expanded the object oriented capabilities of MATLAB® at the m-file level. There were also two new mex API functions introduced at that same time: mxGetProperty and mxSetProperty. Unfortunately, both of these functions work with copies of the properties and not the actual properties themselves. So whereas the old-style class variables can easily and efficiently be accessed with the mex API functions mxGetField, mxGetFieldByNumber, mxSetField, and mxSetFieldByNumber since they use pointers to the original properties, there were no equivalent mex API functions provided for the newer classdef classes. This presents a problem for the mex programmer, particularly if the properties in question are large. Using mxGetProperty will significantly slow the routine down and also risk using up valuable heap memory. The same is true for mxSetProperty.
The new mxGetPropertyPtr C-mex function provided in this package solves half of the problem. It returns a pointer to the original property rather than a pointer to a copy of the property. Thus the property can be accessed efficiently inside a mex routine. The other half of the problem is solved by the new mxSetPropertySDC function, which sets a property to a shared data copy of an mxArray.
These functions have been tested on various Win32 and Win64 versions of MATLAB R2009a - R2019a. For R2018a and later you are expected to use the -R2018a option when compiling your mex code with this submission.
引用格式
James Tursa (2024). mxGetPropertyPtr & mxSetPropertySDC C-mex functions (https://www.mathworks.com/matlabcentral/fileexchange/30672-mxgetpropertyptr-mxsetpropertysdc-c-mex-functions), MATLAB Central File Exchange. 检索时间: .
MATLAB 版本兼容性
平台兼容性
Windows macOS Linux类别
标签
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!版本 | 已发布 | 发行说明 | |
---|---|---|---|
4.1.0.1 | Added missing matlab_version.c file |
||
4.1.0.0 | Updated for R2019a |
||
4.0.0.0 | Updated the doc for 4.00 and R2018a |
||
3.99.0.0 | Updated code for R2018a. (The doc will be updated soon to reflect this) |
||
3.0.0.0 | mxSetPropertySDC now available. |
||
2.0.0.0 | Updated for later versions of MATLAB (which have a different mex input argument passing convention) and tested for various 64-bit versions. |
||
1.0.0.0 |