Access an operator of an object inside a smart ptr http://coliru.stacked-crooked.com/a/f811a7e99cb58873

smartptr_operator.cpp

#include <iostream>
#include <vector>
#include <string>
#include <memory>

struct Foo
{
    Foo(int size) : words(size, "Foo")
    {}
    
    std::vector<std::string> words;
    
    std::string operator [](size_t i)
    {
        return words[i];
    }

};

int main()
{
    Foo f(12);
    
    std::cout << f[0] << '\n';
    
    std::unique_ptr<Foo> ptr(new Foo(12));
    
    std::cout << (*ptr)[0] << '\n';
}