Hi,
When using the GN_MLSL algorithm and passing a pointer to a class as f_data in
void nlopt::opt::set_min_objective(nlopt::vfunc f, void* f_data)
I receive the following error at program execution:
Unhandled exception at 0xffffffff in test_mlsl.exe: 0xC0000005: Access
violation reading location 0xffffffff.
Call Stack:
ffffffff()
> test_mlsl.exe!nlopt::opt::free_myfunc_data(void * p=0x7c840c5b) Line
> 157 + 0x23 bytes C++
ffffffff()
optimize() seems to run perfectly fine, I think the error occurs when the
nlopt::opt object goes out of scope.
I have attached a short sample program that produces the above error on
my windows system (using the precompiled DLL version 2.1.2).
If you don't see an immediate problem with my code, I would also appreciate
a quick test on a different system (*nix oder win) to see if the error
also occurs.
Regards,
Juergen
----- source -----
#include <iostream>
#include <nlopt.hpp>
using namespace std;
class Foo
{
public:
double a;
Foo(double a): a(a) {}
double operator()(const vector<double>& vX, vector<double>& vGrad)
{
double res = 0;
for (int i=0; i<(int)vX.size(); i++)
res += vX[i] * a;
return res;
}
static double wrap(const std::vector<double> &x, std::vector<double> &grad,
void *data)
{
return (*reinterpret_cast<Foo*>(data))(x, grad);
}
};
int main()
{
int major, minor, bugfix;
nlopt::version(major, minor, bugfix);
cout << major << "." << minor << "." << bugfix << endl;
const int N = 5;
vector<double> lb(N, -10);
vector<double> ub(N, 10);
vector<double> x(N, 0);
nlopt::opt opt(nlopt::GN_MLSL, N);
opt.set_lower_bounds(lb);
opt.set_upper_bounds(ub);
nlopt::opt optLocal(nlopt::LN_NELDERMEAD, N);
opt.set_local_optimizer(optLocal);
Foo foo(1.0);
opt.set_min_objective(Foo::wrap, &foo);
opt.set_maxtime(1);
double minval = 0;
nlopt::result result = opt.optimize(x, minval);
cout << minval << " at ";
for (int i=0; i<N; i++)
cout << " " << x[i];
cout << endl;
return 0;
}
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