如何在C ++中向标准库添加我们自己的函数

Question

I want to add my own function to the standard library in because when I want to use this function in another program. Then I can use them easily by just including the header then it can save me time and there is no need of rewriting the function again.

Answer 1

NEVER, EVER, EVER edit the standard library!!! Some compilers may not even use them, so if you #include <cmath> , it may not even use the cmath header, and use its knowledge about to standard library to make the math functions available. Even if it doesn't do that, it will increase the size of any other programs that use that header, even if they don't use your function.

But I still don't want to rewrite my function!

You don't have to. You can add your own header into the include paths of your compiler (typically /usr/include on *NIX), and include it like any other standard header. Or, you could save your function in a file in the directory of a file that needs it, and #include it like this:

#include "my1.h"

Conclusion

Don't edit the standard headers. Just add your own.