#include <type_traits>
#include <iostream>
#include <memory>
 
template<template<typename> class X, typename T> struct instantiation_of : public std::false_type {};
template<template<typename> class X, typename Y> struct instantiation_of<X, X<Y>> : public std::true_type {};
 
int main() {
    std::cout << instantiation_of<std::shared_ptr, int>::value << "\n";
    std::cout << instantiation_of<std::shared_ptr, std::shared_ptr<int>>::value << "\n";
}

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