The Octave run-time allows global operators to be implemented,
e.g. op_scalar_add_X for adding a scalar and a wrapped struct X.
However it doesn't currently seem possible for these operators to
map to SWIG-wrapped functions. This is because dispatch_global_op()
looks for the operators to be installed as global variables, whereas
install_global() installs SWIG-wrapped functions as builtin functions;
the two appear to be separate symbol tables in Octave.
This patch modifies install_global() to install global operator functions
as both builtin functions and as global variables, where the value of the
global variable is a function handle to the operator function. It decides
if a function is a global operator if it begins with the prefix "op_"; this
prefix can be modified through a new command-line variable. It also always
installs the operators globally, regardless of whether the rest of the module
is being loaded globally. To accomplish this, install_global() is now always
called, but takes a bool argument specifying whether it should load symbols
globally. If a function is not a global operator, install_global() should
behave as before.
Tested that this compiles and works on Octave 3.2.4 and 3.4.0.
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12675 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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