What is mean of #name ?

[buddha87]

I saw some codes using macro definition to define a function alais. But I don't understand why it put "#" before argument like this :

#define RegisterTcpFlow(name) \
    RegisterFlow(#name, &name::Construct, eTcp); \ 

What does #name mean ?

Thanks in advance.

[Peter87]

It will give you the name as a string.

RegisterTcpFlow(hello) will expand to RegisterFlow("hello", &hello::Construct, eTcp);

[buddha87]

Thank you for reply. So it means it will convert hello as a variable to a string which is the variable name. Correct ?

[Peter87]

You can pass almost anything as argument to a macro, not just variables.

1 2 3 4 5 6 7 8

#include <iostream> #define STR(str) #str int main() { std::cout << STR(This will be turned into a string.\n\t123...); }

This will be turned into a string. 123...