I have tried code written on some link provided for dynamic function call , but unable to run code on machine .I tried to run code present at stackoverflow.com/questions/15764078/dynamically-creating-a-c-function-argument-list-at-runtime through member function. It is is giving bad call exception while running : Code snnippets
#include <iostream>
#include <functional>
#include <stdexcept>
#include <string>
#include <boost/any.hpp>
class Test;
class Test
{
public:
template <typename Ret, typename... Args>
Ret callfunc (std::function<Ret(Args...)> func, std::vector<boost::any> anyargs);
template <typename Ret>
Ret callfunc (std::function<Ret()> func, std::vector<boost::any> anyargs)
{
if (anyargs.size() > 0)
throw std::runtime_error("oops, argument list too long");
return func();
}
template <typename Ret, typename Arg0, typename... Args>
Ret callfunc (std::function<Ret(Arg0, Args...)> func, std::vector<boost::any>anyargs){
if (anyargs.size() == 0)
throw std::runtime_error("oops, argument list too short");
Arg0 arg0 = boost::any_cast<Arg0>(anyargs[0]);
anyargs.erase(anyargs.begin());
std::function<Ret(Args... args)> lambda =
([=](Args... args) -> Ret {
return func(arg0, args...);
});
return callfunc (lambda, anyargs);
}
template <typename Ret, typename... Args>
std::function<boost::any(std::vector<boost::any>)> adaptfunc (Ret (Test::*func)(Args...)) {
std::function<Ret(Test*,Args...)> stdfunc = func;
std::function<boost::any(std::vector<boost::any>)> result =
([=](std::vector<boost::any> anyargs) -> boost::any {
return boost::any(callfunc(stdfunc, anyargs));
});
return result;
}
int func1 (int a)
{
std::cout << "func1(" << a << ") = ";
return 33;
}
};
int main ()
{
Test a;
std::vector<std::function<boost::any(std::vector<boost::any>)>> fcs =
{
a.adaptfunc(&Test::func1)};
std::vector<std::vector<boost::any>> args =
{{777}};
// correct calls will succeed
for (int i = 0; i < fcs.size(); ++i)
std::cout << boost::any_cast<int>(fcs[i](args[i])) << std::endl;
return 0;
}
This code compiled successfully But it failed to run and crashed In main function for loop.
