From: Alcides Viamontes Esquivel (alve_at_[hidden])
Date: 2008-02-14 21:29:21
I would like to know if there's a boost library for solving this
problem, or if not, if it would be of general interest one.
Suppose you have a function in an external library that you want to use,
and it have this prototype:
/* external library function prototype */
double qk15( double(*f)(double), double a, double b);
(this example mimics QUADPACK, a great and wonderful library for
If you want to have a (good) chance of using qk15 with a reentrant
function, then the correct prototype would be, at least
double qk15( double(*f)(double, void*), double a, double b,
which is something that for example gsl
(http://www.gnu.org/software/gsl/ ) does. But that's not the case and
modifying qk15 is out of the question.
So, the "solution" library I'm asking for should be a C++ header library
that would, for example, bring this interface to the user:
// Hypothetical library
// client functor supplied by the user, to be used in some
// way with 'qk15'
double operator()(double x)
// an instance of the functor
// first parameter is the legacy function, following parameter
// types are deduced from the prototype of qk15 (if
// possible), being each one of the same original type that
// qk15 requires but changing raw function pointers by generic
// functors (automatic type replacement or user-guided).
boost::enable_reentrant(qk15, cpp_f, a, b);
// As a postcondition to this call, function qk15 should
// be called once with a function pointer to something that
// ensures that operator() on 'any_functor' instance get's
// called with the corresponding 'this'.
If I'm missing something terrible obvious please signal it to me. I
think enable_reentrant can be implemented in at least one (almost)
portable way, using a stack in thread local storage. Boost.Thread
already give access to such feature in a satisfactory way.
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