Here's another example: Test code: #include <memory> int main() { std::unique_ptr<int> pPointer = std::make_unique<int>(); return 0; } He

Here's another example: Test code: #include <memory> int main() { std::unique_ptr<int> pPointer = std::make_unique<int>(); return 0; } Here's the GCC output (v4.9.2) with C++14: geezerjay@debian:tmp$ g++ --std=c++14 main.c++ geezerjay@debian:tmp$ And now the GCC output with C++11: geezerjay@debian:tmp$ g++ --std=c++14 main.c++ main.c++: In function ‘int main()’: main.c++:5:34: error: ‘make_unique’ is not a member of ‘std’ std::unique_ptr<int> pPointer = std::make_unique<int>(); ^ main.c++:5:51: error: expected primary-expression before ‘int’ std::unique_ptr<int> pPointer = std::make_unique<int>(); geezerjay@debian:tmp$ Perhaps recent GCC versions catch this issue, but errors are indeed thrown if make_unique, a C++14 feature, is present while compiling C++11 code.