Size not declared

[MatthewDowns]

I’ve been following the Ultimate C++ course and I have reached part 2, and I am doing the sorting arrays class. I tried to do the bubble array exercise but couldn’t work it out so I followed the solution Mosh gave but I’ve come to an error I don’t really understand. I have checked the solution against my code several times and I can not find the error it just keeps telling me that “size” was not declared in this scope.

[POMPOMBALLS]

Check your compiler version.

Using std::size

I have found that many still have issue using std::size() general template function. As mentioned on C++ reference, std::size was implemented in C++17. Now, the difference comes with the compiler used when using the said implementation. Assume following example. #include <iostream> int main() { int numbers[] = {10, 20, 30, 40, 50}; std::cout << std::size(numbers); return 0; } The example works on C++17 (GCC) and newer versions (C++20)). But it does not work on C++17…