C++: Allow disabling exceptions in opt::optimize. #580
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jschueller
reviewed
Dec 20, 2024
jschueller
reviewed
Dec 21, 2024
Call opt.set_exceptions_enabled(false) before opt.optimize to avoid throwing an exception. The caller is then responsible for checking the returned result or opt.last_result(). The advantage is that, for the SWIG-friendly overload, the returned best point (which can be quite good in, e.g., the roundoff_limited case) is not lost (but then the caller MUST check opt.last_result() to know whether anything has gone wrong). The default is exceptions_enabled=true, so by default, nothing changes. src/api/nlopt-in.hpp (opt::exceptions_enabled): New private member variable. (opt::opt (all overloads)): Initialize it (default it to true, copy it in the copy constructor). (opt::operator=): Copy it. (opt::optimize): Only call mythrow if exceptions_enabled. (get_exceptions_enabled): New public inline getter. (set_exceptions_enabled): New public inline setter.
doc/docs/NLopt_C-plus-plus_Reference.md, doc/docs/NLopt_Guile_Reference.md, doc/docs/NLopt_Python_Reference.md (Performing the optimization): Add "by default" wording to the claim that `optimize()` throws an exception for negative return codes. (The sentence already links to the "Exceptions" section that has the details.) (Exceptions): Document nlopt::opt::set_exceptions_enabled and nlopt::opt::get_exceptions_enabled, and adapt the remainder of the section to mention their impact where appropriate.
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test/t_java.java: Tests exception handling. This tests a test case known to fail (t_bounded.cxx on LD_SLSQP) with set_exceptions_enabled set to true if the argument is 1, false if the argument is 0, and verifies that the exception is thrown resp. not thrown, as expected. test/CMakeLists.txt: Add the C++ test t_except with the instances 1 (true = exceptions enabled) and 0 (false = exceptions disabled). Both instances pass.
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Call opt.set_exceptions_enabled(false) before opt.optimize to avoid throwing an exception. The caller is then responsible for checking the returned result or opt.last_result(). The advantage is that, for the SWIG-friendly overload, the returned best point (which can be quite good in, e.g., the roundoff_limited case) is not lost (but then the caller MUST check opt.last_result() to know whether anything has gone wrong). The default is exceptions_enabled=true, so by default, nothing changes.
src/api/nlopt-in.hpp (opt::exceptions_enabled): New private member variable.
(opt::opt (all overloads)): Initialize it (default it to true, copy it in the copy constructor).
(opt::operator=): Copy it.
(opt::optimize): Only call mythrow if exceptions_enabled. (get_exceptions_enabled): New public inline getter. (set_exceptions_enabled): New public inline setter.