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  1. #include <iostream>
  2. #include <string>
  3. #include <memory>
  4.  
  5.  
  6.  
  7. #include <cstddef>
  8. #include <memory>
  9. #include <type_traits>
  10. #include <utility>
  11.  
  12. namespace future{
  13.     using namespace std;
  14.     template<class T> struct _Never_true : false_type { };
  15.  
  16.     template<class T> struct _Unique_if {
  17.         typedef unique_ptr<T> _Single;
  18.     };
  19.  
  20.     template<class T> struct _Unique_if<T[]> {
  21.         typedef unique_ptr<T[]> _Runtime;
  22.     };
  23.  
  24.     template<class T, size_t N> struct _Unique_if<T[N]> {
  25.         static_assert(_Never_true<T>::value, "make_unique forbids T[N]. Please use T[].");
  26.     };
  27.  
  28.     template<class T, class... Args> typename _Unique_if<T>::_Single make_unique(Args&&... args) {
  29.         return unique_ptr<T>(new T(std::forward<Args>(args)...));
  30.     }
  31.  
  32.     template<class T> typename _Unique_if<T>::_Single make_unique_default_init() {
  33.         return unique_ptr<T>(new T);
  34.     }
  35.  
  36.     template<class T> typename _Unique_if<T>::_Runtime make_unique(size_t n) {
  37.         typedef typename remove_extent<T>::type U;
  38.         return unique_ptr<T>(new U[n]());
  39.     }
  40.  
  41.     template<class T> typename _Unique_if<T>::_Runtime make_unique_default_init(size_t n) {
  42.         typedef typename remove_extent<T>::type U;
  43.         return unique_ptr<T>(new U[n]);
  44.     }
  45.  
  46.     template<class T, class... Args> typename _Unique_if<T>::_Runtime make_unique_value_init(size_t n, Args&&... args) {
  47.         typedef typename remove_extent<T>::type U;
  48.         return unique_ptr<T>(new U[n]{ std::forward<Args>(args)... });
  49.     }
  50.  
  51.     template<class T, class... Args> typename _Unique_if<T>::_Runtime make_unique_auto_size(Args&&... args) {
  52.         typedef typename remove_extent<T>::type U;
  53.         return unique_ptr<T>(new U[sizeof...(Args)]{ std::forward<Args>(args)... });
  54.     }
  55. }
  56.  
  57.  
  58.  
  59.  
  60. int main() {
  61. 	std::string ss("hello");
  62.     auto u_str = future::make_unique<std::string>(ss);
  63.     std::cout << u_str->c_str() <<std::endl;
  64.     std::cout << *u_str <<std::endl;
  65. 	return 0;
  66. }
Success #stdin #stdout 0s 3272KB
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stdin
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Standard input is empty
stdout
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hello
hello
https://ideone.com/dNxCJf
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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