Support calculation for Partial time barrier PUT options and expose to Python-SWIG

[flogger007]

On Tue, 7 May 2024 at 20:35, Luigi Ballabio <luigi.ballabio@gmail.com> wrote:
Does this also hold for partial-time barrier options?

Luigi

On Mon, Apr 29, 2024 at 9:44 AM Ashish Bansal <ashish4bansal@gmail.com> wrote:
Hi all,

I am looking at the Partial Time barrier code to calculate the value of PTB options and noticed that the Put is not supported:
https://rkapl123.github.io/QLAnnotatedSource/d0/d16/analyticpartialtimebarrieroptionengine_8cpp_source.html
Line# 111:
case Option::Put:
QL_FAIL("Partial-time barrier Put option is not implemented");

I was wondering if the Put valuation can be implemented using the Put-Call Symmetry given in the Haug book, section # 4.17.8:
Use of Put-Call Symmetry for Barrier Options

P.S. I am using Python SWIG so need this supported in there too.

Regards
Ashish