Version 2.2:
Added ability to specify workspace explicitly and bypass internall snMem* calls. In the C++ interface, new constructors allow passing iw/leniw and rw/lenrw. In the C interface, new initialization calls snInitW and snInitWX let user pass iw/leniw and rw/lenrw.
In all cases, if leniw or lenrw is less than 500, then the workspace will be automatically allocated. If iw or rw is NULL, then the workspace is allocated with leniw/lenrw if those values are acceptable, otherwise snMem* is called. If iw and rw are not NULL, then no internal allocation is done and the workspace and lengths are accepted.
Version 2.1:
New calls to snInit/snSpec added that allow the user to define the Fortran file unit numbers to be used with the print file, summary file, and specs file.
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Works with SNOPT 7.7+
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In C: snInitX, setPrintfileX, setSpecsfileX have additional integer arguments for Fortran unit numbers
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In C++: Added overloaded initialize, setPrintFile, setSpecsfile to accept Fortran unit numbers
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Internally, renamed f_sninit, f_snspec Fortran subroutines to f_sninitf, f_snspecf and changed to call sninitf, snspecf (without Fortran unit numbers and new in SNOPT 7.7). f_sninit and f_snspec now call snInit and snSpec with Fortran unit number
Please see
https://ccom.ucsd.edu/~optimizers/docs/snopt/
for more information on how to link to the libraries and use the C/C++ interface.