added nodiscard attribute to std::make_unique()

Author: lukasx999

libcxx/include/memory

@@ -566,15 +566,15 @@ class bad_weak_ptr
 };
 
 template<class T, class... Args>
-constexpr unique_ptr<T> make_unique(Args&&... args);                            // C++14, constexpr since C++23
+[[nodiscard]] constexpr unique_ptr<T> make_unique(Args&&... args);                            // C++14, constexpr since C++23
 template<class T>
-constexpr unique_ptr<T> make_unique(size_t n);                                  // C++14, constexpr since C++23
+[[nodiscard]] constexpr unique_ptr<T> make_unique(size_t n);                                  // C++14, constexpr since C++23
 template<class T, class... Args> unspecified   make_unique(Args&&...) = delete; // C++14, T == U[N]
 
 template<class T>
-  constexpr unique_ptr<T> make_unique_for_overwrite();                        // T is not array, C++20, constexpr since C++23
+  [[nodiscard]] constexpr unique_ptr<T> make_unique_for_overwrite();                        // T is not array, C++20, constexpr since C++23
 template<class T>
-  constexpr unique_ptr<T> make_unique_for_overwrite(size_t n);                // T is U[], C++20, constexpr since C++23
+  [[nodiscard]] constexpr unique_ptr<T> make_unique_for_overwrite(size_t n);                // T is U[], C++20, constexpr since C++23
 template<class T, class... Args>
   unspecified make_unique_for_overwrite(Args&&...) = delete;                  // T is U[N], C++20