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#include <iostream>
#include <memory>
 
class Base
{
public:
    Base() {}
};
 
class Derived : public Base
{
public:
    Derived() {}
    Derived(std::initializer_list<std::pair<int, std::shared_ptr<Base>>>) {}
};
 
int main(int argc, char ** argv)
{
    // auto example = new Derived({
    //     { 0, std::make_shared<Derived>() }
    // });
 
    auto example = new Derived({
        { 0, std::make_shared<Derived>({
            { 0, std::make_shared<Derived>() }
        }) }
    });
 
    return 0;
}

prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:26:10: error: too many arguments to function ‘std::shared_ptr<_Tp1> std::make_shared(_Args&& ...) [with _Tp = Derived; _Args = {}]’
         }) }
          ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/shared_ptr.h:610:5: note: declared here
     make_shared(_Args&&... __args)
     ^
prog.cpp:23:10: warning: unused variable ‘example’ [-Wunused-variable]
     auto example = new Derived({
          ^

Standard output is empty