Lookup and invoke a CPP function at runtime

cpp_lookup.mm

#import <Foundation/Foundation.h>
#include <string>
#include <dlfcn.h>

class Foo {
    int bar = 0;
    std::string toString();
};

std::string Foo::toString() {
    this->bar++;
    return "hello " + std::to_string(this->bar);
}

typedef std::string (*ReturnsString)(void *);

int main(int argc, const char * argv[]) {
    std::string (*toStringMethod)(void *) = (ReturnsString)dlsym(RTLD_DEFAULT, "_ZN3Foo8toStringEv");
    if (!toStringMethod) return 0;

    auto foo = Foo();

    void *fooptr = &foo;
    auto hellostr = toStringMethod(fooptr);

    if ([@"hello 1" isEqualToString:@(hellostr.c_str())]) {
        NSLog(@"yay");
    }

    return 0;
}