How to implement make_unique function in C++11? [duplicate]

Question

My compiler doesn't support make_unique. How to write one?

template< class T, class... Args > unique_ptr<T> make_unique( Args&&... args ); 

Answer 1

Version by Stephan T. Lavavej (also known by STL) who originally proposed adding this function to C++14

#include <cstddef> #include <memory> #include <type_traits> #include <utility>  namespace std {     template<class T> struct _Unique_if {         typedef unique_ptr<T> _Single_object;     };      template<class T> struct _Unique_if<T[]> {         typedef unique_ptr<T[]> _Unknown_bound;     };      template<class T, size_t N> struct _Unique_if<T[N]> {         typedef void _Known_bound;     };      template<class T, class... Args>         typename _Unique_if<T>::_Single_object         make_unique(Args&&... args) {             return unique_ptr<T>(new T(std::forward<Args>(args)...));         }      template<class T>         typename _Unique_if<T>::_Unknown_bound         make_unique(size_t n) {             typedef typename remove_extent<T>::type U;             return unique_ptr<T>(new U[n]());         }      template<class T, class... Args>         typename _Unique_if<T>::_Known_bound         make_unique(Args&&...) = delete; } 

EDIT: updated code to the N3656 standard revision