Yeah it's true that restrict is well supported, mostly because all C++ compilers are also C compilers. Maybe the biggest reason why C++ is slower in practice i

Yeah it's true that restrict is well supported, mostly because all C++ compilers are also C compilers. Maybe the biggest reason why C++ is slower in practice is because the programmers tend to feel that using features unique to C++ almost mandatory. Even though technically the pure C program also compiles fine in C++.